Here's [1] the Steam page for split screen games. Currently there are 934. Can't go wrong with Earth Defense Force! And no you don't need a "gaming PC." That term doesn't even make any sense in modern times, because if you have a computer from within the past decade or so, you can run the overwhelming majority of games with no problem. And I mean that literally - for instance GTA V requires an AMD HD 4870 card. That card was released in 2008!