I finished it once, but had problems with the final Sin Box.
Havent played that in years!
That’s a LOOONG time ago, but I do recall finishing it.
I remember playing it a long time ago - I think it was a Game Boy DS title? I ended up using the same two heroes throughout the game because leveling everything was so tedious. I recall the last box being a bit tricky - I think they added in an extra symbol type (star/moon) just to screw with you?