Gunpey DS - Music x Puzzle (USA) is a music-based puzzle game developed by Q Entertainment for the Nintendo DS. In Japan, the game is known as Gunpey DS - Reverse of Revolver (ガンペイDS リバースオブリボルバー). The game features a unique blend of puzzle and music elements, challenging players to complete puzzles while playing along to the rhythm of the music. Players must use their stylus to connect lines on the screen in order to complete puzzles. The game features several different game modes, including the main Puzzle Mode and the Challenge Mode. In Puzzle Mode, players must complete puzzles by connecting lines of the same color while the music plays in the background. The Challenge Mode features a more difficult set of puzzles, with faster-paced music and more complex puzzles. Players can also customize their game experience by selecting from a wide variety of music tracks, from classical to modern. The game also features a variety of difficulty levels, allowing players to choose the level of challenge that best suits them. Overall, Gunpey DS - Music x Puzzle (USA) is a unique music-based puzzle game that offers players an entertaining and challenging experience. With its wide variety of music tracks and difficulty levels, the game is sure to provide hours of entertainment for puzzle fans.