20XX" and "30XX" refer to a popular series of cooperative, roguelike action-platformer video games heavily inspired by the classic Mega Man X series, with 30XX being the direct sequel to 20XX, improving upon its predecessor with more content, polished controls, new mechanics (like Power Fusion), and enhanced co-op features, all while maintaining the fast-paced, procedurally generated level design and challenging boss fights. | Radical Reggie