The html code 

 

<!-- Place this code where you'd like the game to appear -->
<div class="miniclip-game-embed" data-game-name="agar-io" data-theme="0" data-width="1100" data-height="1000" data-language="en"><a href="http://www.miniclip.com/games/agar-io/">Play agar.io</a></div>
<p style="text-align:center;"><a href="http://www.miniclip.com/games/agar-io/" target="_blank">Play agar.io</a> / More <a href="http://www.miniclip.com/games/genre-2/" target="_blank">Multiplayer games</a></p>

<!-- Insert this code before your </body> tag -->
<script src="//static.miniclipcdn.com/js/game-embed.js"></script>