"When I was playing on my emulator, I managed to find these curious measures to avoid piracy in Sonic games.
In Sonic 1, the levels put an immovable wall preventing you from advancing.
In Sonic 2 they remove all the objects, rings, checkpoints, and the boxes are replaced by Eggman's face that will kill you instantly, making you replay the level completely.
In Sonic CD it won't let you pass the first level, and the game will restart.
Finally, in Sonic 3 the special levels are replaced by much more difficult versions, preventing you from getting the emeralds and the good ending."
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