I haven't replayed too many games recently.
I played more 16 and 8-bit games over and over again. Sports, fighting and racing games don't count IMHO, since all you do is replay them.
Some of the top ones are probably:
Strider (NES)
Bloody Wolf (TG-16)
Star Fox (SNES)
Starflight (Genesis/PC)
Bonk's Adventure (TG-16)
Mega Man 2 (NES)
English
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I love retro gaming XD