A post-apocalyptic zombie infested world where simply breathing can kill you, while roaming bandits kill anyone in sight for scraps and the two most powerful factions who can pave the way to a better future spend their time fighting a war between themselves.
Minecraft: Making things from blocks is awesome and everything but when you have monsters...
*cough* ... creative mode... *cough*
Definetely Minecraft and San Andreas. Why Minecraft? All you'd need to do in geometry is learn how to draw square. And why San Andreas? It's similar to real life... BUT WITH JETPACKS.
That's boring. I don't want to be some dude flying around building things and having to do the same thing day and night without having anyone to see my work. Sure you could make villagers(at least I think you can) but they don't state their thoughts on your work, plus you have no idea if they're even people.
