I don't suppose anyone could give a sure fire way to start a Steam game without the Steam client, such that I could create desktop or ideally. Ok so here is my delima. I want to play a steam game (Terraria), that I legitimately bought, without having to run or start Steam at all. You can't. Either you can launch the game through Steam, or you can launch the play like that,but that will still have Steam running just like in online mode. It's not possible to play your Steam games without running Steam.