Game Ular menggunakan HTML5

Berikut ini source code yang saya dapatkan dari web sebelah. Silahkan copy paste dan berikan nama game.html, kemudian jalankan pada browser Anda (browser mendukung html5)

<!DOCTYPE html>
<html lang="en">
 
 <head>
 <meta charset="utf-8">
 <title>Game Ular menggunakan HTML5</title>
 <!-- Style -->
 
 <style type="text/css">
 body {
 text-align:center;
 font-family:arial
 }
 canvas {
 border:5px dotted #ccc;
 }
 h1 {
 font-size:50px;
 text-align: center;
 margin: 0;
 padding-bottom: 25px;
 }
 </style>
 <script type="text/javascript">
 function play_game() {
 var level = 160; // Level game, semakin rendah nilai maka gerakan ular akan semakin cepat
 var rect_w = 45; // Lebar
 var rect_h = 30; // Tinggi
 var inc_score = 50; // Score
 var snake_color = "#006699"; // Warna ular
 var ctx; // Attribute canvas
 var tn = []; // Penyimpan arah sementara
 var x_dir = [-1, 0, 1, 0]; // Penyesuaian posisi
 var y_dir = [0, -1, 0, 1]; // Penyesuaian posisi
 var queue = [];
 var frog = 1; // defalut makanan ular
 var map = [];
 var MR = Math.random;
 var X = 5 + (MR() * (rect_w - 10)) | 0; // Penghitungan posisi
 var Y = 5 + (MR() * (rect_h - 10)) | 0; // Penghitungan posisi
 var direction = MR() * 3 | 0;
 var interval = 0;
 var score = 0;
 var sum = 0,
 easy = 0;
 var i, dir;
 var c = document.getElementById('playArea'); // Memulai Area Game
 ctx = c.getContext('2d');
 for(i = 0; i < rect_w; i++) { // Posisi Map
 map[i] = [];
 }
 
 function rand_frog() { // Penempatan makanan ular secara acak
 var x, y;
 do {
 x = MR() * rect_w | 0;
 y = MR() * rect_h | 0;
 } while (map[x][y]);
 map[x][y] = 1;
 ctx.fillStyle = snake_color;
 ctx.strokeRect(x * 10 + 1, y * 10 + 1, 8, 8);
 }
 rand_frog();
 function set_game_speed() {
 if(easy) {
 X = (X + rect_w) % rect_w;
 Y = (Y + rect_h) % rect_h;
 }--inc_score;
 if(tn.length) {
 dir = tn.pop();
 if((dir % 2) !== (direction % 2)) {
 direction = dir;
 }
 }
 if((easy || (0 <= X && 0 <= Y && X < rect_w && Y < rect_h)) && 2 !== map[X][Y]) {
 if(1 === map[X][Y]) {
 score += Math.max(5, inc_score);
 inc_score = 50;
 rand_frog();
 frog++;
 }
 ctx.fillRect(X * 10, Y * 10, 9, 9);
 map[X][Y] = 2;
 queue.unshift([X, Y]);
 X += x_dir[direction];
 Y += y_dir[direction];
 if(frog < queue.length) {
 dir = queue.pop()
 map[dir[0]][dir[1]] = 0;
 ctx.clearRect(dir[0] * 10, dir[1] * 10, 10, 10);
 }
 } else if(!tn.length) {
 var msg_score = document.getElementById("msg");
 msg_score.innerHTML = "Game Over<br /> Your Score : <b>" + score + "</b><br /><br /><input type='button' value='Play Again' onclick='window.location.reload();' />";
 document.getElementById("playArea").style.display = 'none';
 window.clearInterval(interval);
 }
 }
 interval = window.setInterval(set_game_speed, level);
 document.onkeydown = function (e) {
 var code = e.keyCode - 37;
 if(0 <= code && code < 4 && code !== tn[0]) {
 tn.unshift(code);
 } else if(-5 == code) {
 if(interval) {
 window.clearInterval(interval);
 interval = 0;
 } else {
 interval = window.setInterval(set_game_speed, 60);
 }
 } else {
 dir = sum + code;
 if(dir == 44 || dir == 94 || dir == 126 || dir == 171) {
 sum += code
 } else if(dir === 218) easy = 1;
 }
 }
 }
 </script>
 </head>
 
 <body onload="play_game()">
 <h3>Play</h3>
 <div id="msg"></div>
 <canvas id="playArea" width="450" height="300">Maaf browser Anda tidak mendukung html5.</canvas>
 </body>
 </html>

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