Clear lines of similarly-shaped pieces and they dissapear, while being quick enough to avoid new falling pieces. It really is everything you should expect from Bullet-Proof Software: it's a well-presented, easy to pick up and addicting Tetris-style puzzle game. Sprite work is very solid and the atmosphere kept me engaged until the very end. Regular game isn't too hard, containing 100 stages which were pretty easy but fun for me to play through.

Cartridge also contains split-screen multiplayer (which I have yet to try) and a Puzzle mode in which you have to clear a preexisting set of lines in a maximum amount of moves. There are 100 of these puzzles, and they were designed by Tetris creator Alexei Pazhitnov. Don't really feel like playing these for the time being, but if I ever want to get better at the main game (to speedrun or whatever), then those puzzles could help me get better at the game.

Regardless, it has a lot to do and has very fine replayability. Worth obtaining.