Gunpey, a version released for the WonderSwan, appears to be a variation of an earlier Gunpey title. The [M] and [f1] notations may indicate a mature rating and a specific revision or version of the game. Without deeper research, it's difficult to pinpoint the precise changes made in this iteration.   More information on the developer and release details of this specific version is needed to understand its relationship to other GunPey games.

GunPey (J) [M][f1]

Guilty Gear Petit (J)