According to the Monaco twitter, courtesy of Joystiq, the game will be available for XBLA and Steam simultaneously but preorders are only for Steam.
HumbleStore will provide the preorders with four pack preorders available. Another twitter post promises “MAJOR preorder bonus goodies.”
The game allows you to play up to 4 player co-op online or on the same screen where a player must use the skills of their character class for objectives.
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