He had to go and travel in the Ruins of Alph with the King of Games. Who solved a puzzle and thereby dropped him down a hole. (As you do.)

That'd be perfect! Depending how long his journey with Yuugi takes he'll also be checking in ~in secret~ with the Team over the network and leveling up his Psychics in preparation. But once he's back in Goldenrod he'll be eager to collaborate in person!