Two apps I'd recommend are Plague Inc (a little weird, but great for teaching geography and, to some degree, biology) and, of course, Minecraft. I'm glad to see Zoo Tycoon on the list--it was a favorite of mine. smile
http://www.ndemiccreations.com/en/22-plague-inc
https://minecraft.net
https://en.m.wikipedia.org/wiki/Zoo_Tycoon_(series)

Last edited by Raevyn; 04/16/16 06:15 AM. Reason: Added links
Happiness can be found even in the darkest of times, if only one remembers to turn on the light.