Chrome OS:

Download from link above.
Open FZ2...zip file in your files app by double clicking on it. Doing this should temporarily extract the folder.
Open boot.html by double clicking on it.
Password is “drowssap”
Play games

Windows:

Download from link above.
Find the zip file in file explorer. Windows key + E opens file explorer (zip is probably under downloads)
Right click on the zip file and select extract all.
Once that finishes, open the extracted zip file (you can now delete the .zip file)
Open boot.html (in browser)
Password is “drowssap”

Mac OS

Get a real computer
Honestly I am not completely sure but I assume it's the same as windows mostly.

Linux

Depends on which distribution but it's about the same as windows.
Does anyone actually have linux at school?