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contracts/Pong.sol

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+/*
+ * -----------------------------------------------------------------------------------
+ * "THE BEER-WARE LICENSE" (Revision 42):
+ * <miguel.astor@ciens.ucv.ve> wrote this file. As long as you retain this notice you
+ * can do whatever you want with this stuff. If we meet some day, and you think
+ * this stuff is worth it, you can buy me a beer in return. Miguel Angel Astor
+ * -----------------------------------------------------------------------------------
+ */
+
+pragma solidity ^0.4.24;
+
+import "./Ownable.sol";
+
+contract Pong is Ownable {
+  uint256 timesPlayed;
+
+  event CanPlayTheGame(address indexed player);
+  
+  constructor() public {
+    timesPlayed = 0;
+  }
+  
+  function kill() public onlyOwner {
+    selfdestruct(owner);
+  }
+
+  function howManytimesPlayed() public view returns (uint256) {
+    return timesPlayed;
+  }
+  
+  function play() payable public {
+    require(msg.value == 1000000000000000000);
+    owner.transfer(msg.value);
+    timesPlayed += 1;
+    emit CanPlayTheGame(msg.sender);
+  }
+}