Well you never kill biological things, just an artificially intelligent machine at the end. But also one thing you can do is play the two player co-op mode on

Well you never kill biological things, just an artificially intelligent machine at the end. But also one thing you can do is play the two player co-op mode on Portal 2, which as far as I know is pure puzzle solving. The stories in Portal are great though, especially Portal 2 which is rich and funny. You could just skip the end of the game and I think that would be pretty non violent? I don’t know if destroying a machine counts as violent.