Spinmaster (known in Japan as Miracle Adventure) is a 2D action platformer developed and released by Data East for arcades (running Neo Geo MVS hardware) in December 1993. It was later released for the Neo Geo AES on February 18, 1994.
The first Data East game released for the Neo Geo, players control modern-day treasure hunters Johnny and Tom (previously from Dashin' Desperadoes, released months before this game) as they use a variety of comical weapons (usually their trusted yo-yos) to rescue Johnny's girlfriend Mary from the mad scientist Dr. DePlayne (also the main antagonist of the Tumblepop trilogy). On the way, they must find pieces of a treasure map.
Its cartoonish graphics and gameplay mechanics (including a variety of power-up weapons and the ability to charge up attacks) are identical to the 1991 arcade game Caveman Ninja, also released by Data East.