Double Dragon II on the Game Boy is a stripped-down yet spirited adaptation of the classic arcade beat-'em-up. While its visuals are charmingly simplistic and the gameplay lacks the variety of its bigger brother, it retains the core satisfaction of punching and kicking your way through waves of baddies. The difficulty can be brutal, especially without continues, but dedicated fans of old-school brawlers might find its retro challenge oddly satisfying.