王者巅峰挑战赛已开启，欢迎广大玩家参与。
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<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Mastery Challenge League</title>
<style>
/* Add your styles here */
</style>
</head>
<body>
<h1>Mastery Challenge League</h1>
<p>Open Time:</p>
<ul>
<li>Monday:</li>
<li>Tuesday:</li>
<li>Wednesday:</li>
<li>Thursday:</li>
<li>Friday:</li>
<li>Saturday:</li>
<li>Sunday:</li>
</ul>
<p>Playfield Closed:</p>
<div id="playfield"></div>
<button onclick="startChallenge()">Start Challenge</button>
<script>
// Add your JavaScript code here
</script>
</body>
</html>
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