Wild West Online: Gunfighter is a Mmorpg, developed by Tenderfoot Games, that allows players take on the role of a gunfighter in the Wild West of the 1870s. Players pair up to duel with pistols in simulated 3d settings of the old west. The browser based software is available for free download, for both Windows and Mac platforms. As of March 2010, WWO: Gunfighter had 136,648 registered users.