Tetris DX (GBC, 1998)
I've long considered the 1989 Game Boy version of Alexey Pajitnov's seminal tile-matching game to be the best puzzler ever made. That was before I played the deluxe version, Tetris DX. Boasting beautiful color graphics, three player profiles, and three new modes, Tetris DX is the complete package. Players can choose to play classic marathon mode, or experiment with "Ultra Mode" or "40 Lines." One of the best parts of the game, apart from the backup battery save, which allows high scores to be saved, is a new CPU mode that challenges players to take on the computer. The game's music, as always, is a treat; the post-game animations are wonderful to watch; and the replay value is off the charts. It doesn't get much better than this.