Snail Maze Hang On (past course 8/level 3) Safari Hunt (maybe 1 meter away...) Golden Axe (A++) Slap Shot (with all A Pool teams) Tennis Ace Phantasy Star Super Kick Off (won all modes on top difficulty/speed - though with my preferred wind/ground) Rampage Asterix
(and dozen or two on emulator, but those mostly cheating)
Sonic 1 Sonic Chaos (the most easiest of all) Miracle Warriors Maze Hunter Fantasy Zone Fantasy Zone 2 (the hardest of all) Hang On Outrun Golden Axe Golden Axe Warriors Shinobi Streets of Rage Space Harrier Streets of Rage Michael Jackson's Moonwalker
Still couldn't beat Sonic 2, want to beat it but that game is so damn hard. Kudos to whoever beat that game.