Teenage Mutant Ninja Turtles III: The Manhattan Project is a classic beat 'em up action game published by Konami for the NES, released in 1991, and it is the third game in the TMNT series on the NES, following the success of the first two games. You play as one of the four turtles: Leonardo, Donatello, Raphael, or Michelangelo, fighting through levels to stop the evil Shredder from taking over Manhattan, with a focus on side-scrolling brawling action, cooperative gameplay, and new gameplay mechanics. The gameplay involves fighting waves of enemies, using the turtles' unique weapons and special moves, and you can also perform "team" attacks and pick up items for health and power-ups, with a new "special attack" system where you can perform a powerful screen-clearing move by pressing a combination of buttons. A unique feature is the "level" progression – the game features a more linear structure than the previous games, with new levels, enemies, and boss fights, including a new "dojo" level, and you can also switch between turtles at the beginning of each level, allowing you to choose the best turtle for the challenges ahead. The game includes a two-player cooperative mode, allowing you and a friend to team up and fight through the game together, adding to the fun and replayability. The levels include various New York City locations, each with unique enemies and challenges. The game features a health bar and a continue system. The graphics are colorful and detailed, with a comic book style and well-rendered sprites that capture the look of the characters, and the backgrounds are varied and detailed. The music is catchy and upbeat, with a fast-paced and energetic soundtrack that is iconic. Critics praised the co-op play, the new special attacks, the variety of levels, and the overall fun experience, making it a great addition to the TMNT series. It supports two players. Teenage Mutant Ninja Turtles III: The Manhattan Project is a classic and beloved beat 'em up game for fans of the franchise.