Castle & Dragon

Castle & Dragon (城とドラゴン) is a strategy game from Asobism's Dragon series released for iOS and Android in Japan.

A Rockman collaboration with the game was announced on February 10, 2018. From February 16 to March 2, Rockman can be obtained as a playable character. His default attack is the Rock Buster, and his special skills are Charge Shot and Rush Coil. Players could also obtain costumes and weapons to change his appearance and default attack. Common soldiers could also be dressed like Rockman and Mets. Additionally, there is an optional event to square off against Dr. Wily (with Wily Machine 2).

The Rockman event returned in 2021 between March 12-25 with additional content,, and a promotion was made in the game's official Twitter, with five winners obtaining a copy of R20+5 Rockman & Rockman X Official Complete Works.