Robot Odyssey
What is Robot Odyssey?
Robot Odyssey is a very old game written back in 1984 by The Learning Company for the Apple ][ computer. It's an educational game that teaches the basics of programming through wiring together logic gates. Within the game you solve puzzles by programming robots so they can move around, grab objects, and communicate with each other.
It also happens to be my all-time favorite computer game. It's a purely logical game, with randomness playing a very small part in only a couple of the puzzles. Also, there are no official answers. For every puzzle there can be a number of good solutions. You are basically limited only by your intelligence and imagination.
It's one of those nonviolent games. You don't die, and neither does anyone else. About the worst thing that can happen is you may get stuck. But this is easily solved by reloading a level.