One Punch Man: A Hero Nobody Knows, a fighting game ostensibly about One Punch Man and pals, came out last week for PlayStation 4, Xbox One, and PC. You can play as all manner of fan favorites from the One Punch Man extended universe, including Silverfang, Metal Bat, Tank Top Tiger, and, of course, Mumen Rider. You unlock these characters quickly, but SaitamaOne Punch Man himselfisnt initially available in the games free battle mode. And unlocking him is kind of a doozy.
Source: N4G PC How To Unlock Saitama In The One Punch Man Game