In Yu-Gi-Oh! GX Tag Force, he arrives on the island alongside Umiuma and Inoso after the player has completed the game with all three of the originally available characters as a partner. He requests the player's aide in UmiumaCorp's feud with Sanzyudai Yuki. Should the player agree, he and his companions can be selected as partners for the Tag Force tournament.
The player is able to give Mokuma sandwiches. The following tables detail how much he likes or dislikes the sandwiches.