Games you can replay over and over?

[SegataSanshiro]

Arcade racers
Some RPGs
Shmups
Beat em Ups
Action RPG side scrolling beat em ups like Guardian Heroes,Dragon's Crown.Dungeons & Dragons Mystara etc
Shenmue
Diablo
Most Arcade games
Hack n Slash
Some Platformers
Fighting games
Character Action games
TPS games