GameCritics - For such a trailblazing title, Double Dragon never made much of a mark as a franchise. While the original helped to define the 2.5D beat-em-up and featured a huge number of bold new innovations for the genre (Two-player co-op! Environmental attacks! Moving floors! Kick thrown weapons out of the air!) the characters never caught on with the public, and the series petered out after just five titles, a Neo-Geo fighting game and a crossover with the Battletoads.