vasa-develop · July 21, 2018 18:29 · Jul 21, 2018
diff --git a/EtherGame.sol b/EtherGame.sol
@@ -0,0 +1,38 @@
+contract EtherGame {
+
+    uint public payoutMileStone1 = 3 ether;
+    uint public mileStone1Reward = 2 ether;
+    uint public payoutMileStone2 = 5 ether;
+    uint public mileStone2Reward = 3 ether; 
+    uint public finalMileStone = 10 ether; 
+    uint public finalReward = 5 ether; 
+
+    mapping(address => uint) redeemableEther;
+    // users pay 0.5 ether. At specific milestones, credit their accounts
+    function play() public payable {
+        require(msg.value == 0.5 ether); // each play is 0.5 ether
+        uint currentBalance = this.balance + msg.value;
+        // ensure no players after the game as finished
+        require(currentBalance <= finalMileStone);
+        // if at a milestone credit the players account
+        if (currentBalance == payoutMileStone1) {
+            redeemableEther[msg.sender] += mileStone1Reward;
+        }
+        else if (currentBalance == payoutMileStone2) {
+            redeemableEther[msg.sender] += mileStone2Reward;
+        }
+        else if (currentBalance == finalMileStone ) {
+            redeemableEther[msg.sender] += finalReward;
+        }
+        return;
+    }
+
+    function claimReward() public {
+        // ensure the game is complete
+        require(this.balance == finalMileStone);
+        // ensure there is a reward to give
+        require(redeemableEther[msg.sender] > 0); 
+        redeemableEther[msg.sender] = 0;
+        msg.sender.transfer(redeemableEther[msg.sender]);
+    }
+ }