Amiga versionAccording to the programmer's comments in the DOS release, due to their small-time publisher not understanding the declining Amiga market, the original version performed extremely poorly in the stores: "We sold a grand total of 284 packages of Boppin', one of which was an empty box."
DOS versionThe DOS version has more levels than the original Amiga version and has improved graphics. There are several differences regarding gore, e.g. the Amiga version has a different logo, and when one of the brother's lose they will either shoot themselves in the mouth, or stab themselves in the heart. Information about how to restore this content can be found in the tips & tricks section.
Freeware releaseBoppin' is now available as freeware. The version is fully XP compatible. Check it out here.
Information also contributed by Apogee IV, Pseudo_Intellectual and Satoshi Kunsai