mainly the emulators, but b careful with ps1 emu, its a bit slow as yet.
otherwise, it really depends on what u like, nintendo,sega, or even prefered genres, shoot em up etc.
i stick with my recommendation of super smash bros melee homebrew version, Smashgpsp, because it is fully customisable, u can download extra arenas & characters, and the gameplay feels like the original smash bros in 2d.
if u want it just google for it, its everywhere!
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