I remember playing these games on school laptops

I remember, when i was in 4/5 grade my former school's IT class had 10 Acer laptops with around 15 preinstalled demos and one full game, Blasterball 3 (opened without launcher). I and others played these games on "free days", when the teacher wasn't giving us tasks. A lot of demos had their free coins ran out, so it was lucky to find a laptop with free coins on certain demos. But sometimes teacher disabled internet on all laptops, making it impossible to use free coins and play games, except Blasterball 3.