After the Knuckles' bomb demo, the bottom of the screen is locked, and Sonic can choose to run to the left and die, or to the right to get into the box hall. Sonic will run into the box hall and meet Eggman, waiting to leave the middle box with the mini boss wrapped inside. It doesn't matter if Sonic or Tails is running towards Eggman. He will be activated anyway to prevent another 255 hit bug :P
Bug 0005 description:
Don't run into the box hall completely with Sonic. Leave him at a place where you still can see the background. Now, kill the mini boss with Tails without moving Sonic, and the act switch will be obvious for the first and only time (You can actually see the act switch in MHZ1 too if you're very fast with Hyper Sonic, but you won't see it so obvious like this one).
Bug 0005 was never fixed!
The video of the bug (taken from the last version of Sonic 3 & Knuckles ever compiled) can be downloaded here:
And yeah, this is OMG video!
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