The iPhone is an exceptionally good gaming phone, and it may arguably be Apple's best gaming platform all around (since Apple TV games are really just iPhone games). The iPhone has amazing performance, no matter which iPhone you use, because Apple's processors have long outperformed every Android phone until only recently. Apple offers Apple Arcade, a subscription service with some exclusive games. There are also now emulator apps available on the Apple App Store, though you'll need to copy your own ROMs from your old cartridges to play.