Set after the events of Contra III: Alien Wars, the game follows mercenaries Bill Rizer and Lance Bean as they battle to save the world from a new extraterrestrial threat. Contra 4 takes advantage of the dual screens of the Nintendo DS to deliver larger than life action, with massive enemies, detailed platform gaming and mind-blowing set pieces. Using a variety of upgradable weapons, take the fight to the alien army of the Black Viper and reclaim Earth for Mankind in single-player or 2 player co-op mode.