The "Tag Force" series has appeared on the PlayStation Portable, which adds the ability to form tag team duels, with the first three games in the series being based on the "GX" series (subsequent games are based on "Yu-Gi-Oh! 5D's"). The titles are "Yu-Gi-Oh! GX Tag Force", "Yu-Gi-Oh! GX Tag Force 2" and "Yu-Gi-Oh! GX Tag Force 3". The first game was also ported to PlayStation 2 as "Yu-Gi-Oh! GX: Tag Force Evolution". So far, "Tag Force 3" has not been released in North America. It was however, released in Europe, and its follow up, "Yu-Gi-Oh! 5D's Tag Force 4", has been released in all regions including North America.