From GameBrew - a wiki dedicated to Video Game Homebrew.
SpritesOut is a tile flipping puzzle game for the NDS, similar to Lights Out. The game features sprites from several retro games and from famous NES titles such as Megaman and Super Mario Bros.
The objective is to clear the board of the tiles. Every time you flip a tile, the ones surrounding it are flipped as well.
Big thanks to Mollusk for PAlib, tutorials and utilities.