Ultraman: Power Fighter

Ultraman: Power Fighter pits the fighters of the TV show against each other in the form of a gem puzzle game. Gems gradually fill up the screen from the bottom, but the player can pick up and move gems. If 4 gems of the same color touch, they disappear and are replaced by one gem of the next highest grade. Higher grade gems only need 3 or 2 identical gems touching to upgrade. If the gem pile reaches the top of the screen, you lose. (mobygames.com)