The only games I ever play are single-player straight-forward ones, like the original Halo. You're a fellow with a gun or two and there's not much else to know

The only games I ever play are single-player straight-forward ones, like the original Halo. You're a fellow with a gun or two and there's not much else to know: there's no upgrade ladder, no downloadable content, nothing else to pay for... just go through the story, shoot things and hide behind things, and be on your way. More classic Halo-like games please.