Putty Squad is a platform game done by System 3 Software Ltd. between 1994 and 1995. Even though it was planned to be published for Commodore Amiga, SNES, Sega Genesis / Mega Drive and PC MS-DOS, it ended up to be released for SNES only.
The Amiga version was finished as well, but the publisher Acclaim Entertainment held it back because the Amiga market was too nervous in that time. A few copies of the full Amiga version were sent to PC magazines in order to review them. Since no one kept a copy, it was considered lost and it became one of the most wanted unreleased games.
After almost 20 years, on December 2013, System 3 finally managed to release the Amiga 1200 version as a Christmas gift.
What about the other versions?
Well, the PC port was technically the most advanced one in that time. It even featured short video animations that didn’t appear in other versions. However, it was still in an early stage when the whole project was cancelled, so there is not much more than a playable 4-level-demo that has been sent to several PC gaming magazines.
Unlike the PC version, the Genesis / Mega Drive port was finished too and sent to European magazines, but it remained unpublished due to lack of interest from retailers.
On August 2010, System 3 announced to create remake versions for Sony PlayStation 3 and PlayStation Portable, and Apple iPhone and iPad. In 2014, it has been published for PlayStation 4, PlayStation Vita, PlayStation 3, Nintendo 3DS and Xbox Live Arcade. The iOS and PlayStation Portable versions have been cancelled.