So, If you can choose only 10 games for this system .. which are the best?
The problem with the X68000 is that most games are ports. I don't think I could name any games that were only available on the system, excepting doujin softs.
As far as ports go... Most of the Dempa/Micomsoft games are pretty awesome ports, as are the Capcom and Konami games. My faves unfortunately include games that are simply amazing ports. Strider, for example, is every bit as flawed as the arcade version, but looks 98% as good. Ghouls and Ghosts still pisses me off on the whole, but is stunningly accurate compared with the arcade.
Mr. Do
Super Street Fighter II
Dig Dug
Image Fight (better on FM Towns tho)
Rygar
ChoRenSha
Last Battalion (Better as OverRide on PCE)
Cyber Core
Strider
There are probably more, but I can't be bothered going through my boxes of games to find them. =)
My personal top ten:
Castlevania
Geograph Seal
Cho Ren Sha
ThunderForce ][
Pac-Mania
Star Pulse
Grobda
Final Fight
Nemesis '90
Zugya