Mr. Driller is decent.. way too easy though. I like the Japanese-only Puyo Puyo Fever for the PS1. Devil Dice is amazing, too, though Bombastic is better. I like Puzzle Star Sweep as well. The best ps2 puzzle games are Lumines and Puzzle Quest though.
And I am playing this right now:
Next to Puzzle Fighter, the best PS1 puzzle game -- actually, maybe the best game on the system -- is Intelligent Qube.
