One-Punch Man: A Hero Nobody Knows is a 3D action-fighting game by Spike Chunsoft and Bandai Namco that features custom character creation, 3-on-3 combat, and a unique "Hero Arrival System" where Saitama arrives late to fights. Players progress from a C-Class hero to higher ranks in a world filled with dynamic environmental events and iconic characters from the series. The game requires a minimum of 8 GB RAM and a Core i5-2550 processor for PC play.