So those are buried in the ground, and to get them to pop up you make the signpost land on them! I never could figure out what caused it, I thought it was totally random. Knuckles in LRZ2, drawn over the hidden passage to his section of the level. Spikes were moved over: And, it's been mentioned already, but HPZ's title card is actually Sky Sanctuary Zone, and the SSZ music plays. Mecha Sonic (or Metal Sonic or whateverthecraphe'scalledinthisgame) is ridiculously hard; you're given no rings at all, and he swoops down at you way more than firing those blasts. He swooped down at me like 16 times before he fired a single shot. His vulnerability window in his second attack phase seems a lot smaller, too. Also, the Master Emerald is drawn behind Floating Island instead of in front of it. The timer is frozen at 0:00, so you presumably have unlimited time to beat him. Once you do, he falls off the screen, and nothing else happens.