This is me playing Green Hill Zone 1-3 on Sonic the Hedgehog: Genesis for GBA. Warning: This this the WORST Sonic game to date. It's a horrible remake of the original Sonic 1 for the Sega Genesis, with horrible sound, resized graphics, no level select code, terrible physics,and MASSIVE slowdown. Just watch the slowdown on Act 3, specifically on the boss. That slowdown is NOT Youtube or my recorder. The game actually goes that slow. Also notice the randomly shifting background. That also happens in the game. I'd much rather play the original outdated 16 year old game than this piece of garbage.