A bug I found at the end of Act 2 of Labyrinth Zone zone that I haven't seen documented anywhere. I've seen other people report the point bonuses that are placed too far before the sign post area, but if you enter the place that has the misplaced point bonuses and then go backwards, when you go to the right again, the signpost object has been deleted, so there's no way to end the level. The only thing you can do is wait for the time to run out.
An even more interesting find is that if you have over 50 rings, the big bonus ring will appear in the area you're stuck in. If you jump into it, Sonic will disappear but you will still be stuck on the level screen. If you wait for the time to run out, you will hear Sonic's dying sound and the time will stop at 9:59, but you'll be stuck on the level forever. The only thing you can do is reset or turn off the game.
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