1) Pacman - Arcade
2) Gauntlet - Arcade, Megadrive (aka Gauntlet IV)
3) Dracula X - PC Engine
4) Side Arms - Arcade, PC Engine (don't hit me please ;P)
5) Wonderboy - Arcade (The SMS version sucked!!)
6) Wonderboy in Monsterland - Arcade, PC Engine
7) 1942 - Arcade
8) Macross Love Song - PC Engine
9) Gals Panic series - Arcade, though it would have rocked if Kaneko
ported it to pc-e.
10)Various Mahjong games - Arcade, PC Engine
in no order of course but there are many others that I like.
Will/