His code is pretty damn awesome. Open the site in chrome.  Open web inspector.<p>Paste this into the console:<p>levels.push({
    name: &#x27;super secret-1&#x27;,
    instructions: &#x27;This is a secret level you get no instructions.&#x27;,
    board: &#x27;rggggyyyyy&#x27;,
    style: {&#x27;flex-direction&#x27;: &#x27;column-reverse&#x27;, &#x27;flex-wrap&#x27;: &#x27;wrap-reverse&#x27;, &#x27;align-content&#x27;: &#x27;space-between&#x27;, &#x27;justify-content&#x27;: &#x27;center&#x27;},
    before: &quot;#pond {\n  display: flex;\n&quot;,
    after: &quot;}&quot;,
  });<p>Proceed to the secret 25th level!  You can create your own levels, and make a pull request to his git repository if you really want to add some interesting practice levels.  Just modify levels.js.