There's too many.
Chase HQ, Time Crisis, Operation Wolf, T2, TNMT, The Simpsons, The Avengers, Afterburner, Hang On, Super Off Road, A boat load of the environmentals (star wars, discs of tron, etc), that esoteric shooter i can't ever remember but @retro junkie
has the console version he'd posted on EGA a while back (he should remember what I'm talking about), sunset riders, i could go on for a while
It'd get stale if there's just one. You need a roller ball, a neo multi slotter, one with the fixed gun controller, one where its tethered (lethal enforcers, time crisis, area 51), one or two environmentals, super offroad, a side scroll shooter, a vertical scroll shooter, a beatemup, and something with a gas pedal!