Step 1: Hover over the white window with the title Snake.rar in the top right of window click the box with the arrow in it
Step 2: Once the tab has opened click the download button once downloaded right click and extract it with 7zip or Winrar if you are on chromebook just double click on the file you downloaded and extract it
Step3: Open index.html
P.S: Yes I know all the code is open sourced idc because I got it from github and modified it to make it actually playable so do what ever with it