I like Rock Band and early versions of Harvest Moon.

Puzzle games are peaceful. Tetris is fun. Dr. Mario is especially non-violent because all of those pills have to do something to help this poor pill guzzling patient.

A game like Portal is mostly peaceful. In fact I’d say although they may incorporate violence at some points the core elements of any pure platformer is non-violent. Mario may have you jumping on enemies but it’s just as fun when you’re jumping on moving platforms.

My favorite peaceful game just might be Wii Sports Resort. Sure maybe sword fighting and some other sections are a tad violent but for the most part it’s peaceful. Cutting objects faster than your opponent, exploring the island in a plane, playing frisbee with your adorable Mii dog, table tennis, even basketball.

For me though the amount of violence is almost never a factor when deciding on whether or not to play a game. I care far far more about the genre of the game.