It's fuckin QUARTH. It's Tetris mixed with Space Invaders and maybe better than both. You're in a lil ship and you shoot falling blocks. Your shots add one square to the blocks and you clear them by shooting at them until they form a rectangle.

The Game Boy version has music by Norio Hanzawa, a two player mode via link cable, and six different ships to choose from (that just look different). It's neato. Just a shame it isn't in color.

Game is great. Play it.