Despite games generally using similar copy protection methods, in the Eighties and early Nineties there were several games with unique protections., by Italian studio Simulmondo, which featured its copy-protection method in the starting menu. If one removed it, the game had several protection checks, which, if failed, would make later matches in the game unwinnable. The Amiga version of , after the initial protection check, had another one later, hidden in the code, which would cause a key item to disappear from the game. used an expensive dongle that had to be plugged in the second joystick port. Crackers hacked it pretty fast, so that players were unhappily paying more for a game only because of its complicated protection system. Most famously, on Amiga featured several checks, such as fuzzy bits on disk sectors, which change each time they are read. If the game does not detect the fuzzy bits, it would stop the player before entering the dungeon. Additional anti-piracy checks exist in the code, including checksums and code hidden as images in the graphics file. While these checks did not prevent the game from working, they would significantly slow down progress for the player.
