The "remastered" version of its Sega CD original release, which adds very minor changes such as the possibility to choose between regional soundtracks. The game itself shows some questionable design choices as it tries to do exploration but the level design feels at times tough to navigate through. The time stones minigame is fine, not too terrible, and the final boss fight isn't that hard.
Probably the best things about it are the animated intro and the ominous and creepy original boss theme.