"Marvel Super Hero Squad Online" is a massively multiplayer online game where players form teams with Marvel characters. Players can sign up and play the game on HeroUp.com, as of June 2015.
Visitors to the HeroUp.com home page can click on Play Now, then either log in or register for the game.
The game is based on Marvel Super Hero Squad, a line of action figures. It's available for free, but monthly subscriptions that provide benefits are also available.
In the game, the player chooses a character from his team, then uses that character in missions and activities. Characters improve as the player uses them. The player can control characters with the keyboard or mouse.