Unity whack a mole game 見てわかるUnityゲーム制作超入門　http://www.shuwasystem.co.jp/products/7980html/3849.html

Mole.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Mole : MonoBehaviour {

	[SerializeField] private float delta = 0.01f;
	[SerializeField] private float checkY = 1;
	[SerializeField] private float startY = -1;
	[SerializeField] private float timeDelta = 0;

	private float lastTime = 0;
	private bool gameFlg = true;
	private int counter = 0;

	private GameObject[,] moleData = new GameObject[5,5];
	private bool[,] flgData = new bool[5,5];

	// Use this for initialization
	void Start () 
	{
		createMole();

		Random.InitState(System.Environment.TickCount);
		lastTime = Time.time;
		timeDelta = 1.2f;
		gameFlg = true;
		counter = 0;
	}
	
	// Update is called once per frame
	void Update () 
	{
		if(!gameFlg) return;

		randomSet();

		for(int i = 0; i < 5; i++)
		{
			for(int j = 0; j < 5; j++)
			{
				checkMole(i, j);
				moveTo(i, j);
			}
		}

		checkClicked();
	}

	private void createMole() 
	{
		for(int i = 0; i < 5; i++) 
		{
			for(int j = 0; j < 5; j++)
			{
				GameObject mole = GameObject.CreatePrimitive(PrimitiveType.Capsule);
				mole.transform.Translate((i - 1) * 1.25f, startY, (j - 2) * 1.25f);
				mole.GetComponent<Renderer>().material.color = new Color(0.75f, 0.2f, 0);
				moleData[i, j] = mole;
				flgData[i, j] = false;
			}
		}
	}

	private void randomSet()
	{
		if((Time.time - lastTime) > timeDelta) 
		{
			int x = (int)Mathf.Floor(Random.value * 5);
			int y = (int)Mathf.Floor(Random.value * 5);
			flgData[x, y] = true;
			lastTime = Time.time;
		}
	}

	private void moveTo(int x, int y) 
	{
		if(!flgData[x, y]) return;

		Vector3 pos = moleData[x, y].transform.position;
		Vector3 toVector = new Vector3(pos.x, pos.y, pos.z);
		toVector.y = checkY;
		moleData[x, y].transform.position = Vector3.MoveTowards(pos, toVector, delta);
 	}

	 private void checkMole(int x, int y) 
	 {
		 if(moleData[x, y].transform.position.y == checkY)
		 {
			 Vector3 pos = moleData[x, y].transform.position;
			 pos.y = startY;
			 moleData[x, y].transform.position = pos;
			 flgData[x, y] = false;
		 }
	 }

	 private void checkClicked()
	 {
		 if(Input.GetMouseButtonDown(0))
		 {
			 GameObject obj = getClickObj();
			 if(obj == null) return;

			 for(int i = 0; i < 5; i++)
			 {
				 for(int j = 0; j < 5; j++)
				 {
					 if(obj == moleData[i, j])
					 {
						 Vector3 pos = moleData[i, j].transform.position; 
						 pos.y = startY;
						 moleData[i, j].transform.position = pos;
						 flgData[i, j] = false;
						 timeDelta -= 0.1f;
						 if(timeDelta < 0.1) timeDelta = 0.1f;

						 checkEnd();
					 }
				 }
			 }
		 }
	 }

	 private GameObject getClickObj()
	 {
		 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		 RaycastHit hit;
		 if(Physics.Raycast(ray, out hit, 100)) 
		 {
			 return hit.collider.gameObject;
		 }
		 else
		 {
			 return null;
		 }
	 }

	 private void checkEnd()
	 {
		 counter++;
		 if(counter >= 20) 
		 {
			 gameFlg = false;
		 }
	 }
}