Translations:Proto:Sonic the Hedgehog 2 (Genesis)/Beta 4 to Beta 8/22/en

The collision check for getting crushed seems to be less lenient in Beta 4. The easiest place to see this change is in the lower path at the start of Chemical Plant Act 2, on the platform above the second transport tube with the Super Ring monitor. In Beta 4, if the player walks all the way to the left, they'll be crushed. In other versions, they're able to get to the end without dying.

• Holding Up / Down to scroll the camera up or down wasn't put back in the game until Beta 5.
• Beta 4 still uses the original spike behavior from Sonic 1. From Beta 5 onward, spikes won't hurt the player if they're flashing from post-damage invulnerability.