How do you pass through the circus zone with sonic in hedgehog 3?

You can't "pass through" the Circus Zone in Sonic the Hedgehog 3. It's a fully playable stage in the game. You need to complete all three acts of the Circus Zone to advance to the next stage.

Here's a breakdown of how to navigate the Circus Zone:

* Act 1: The focus here is on platforming. You'll need to navigate spinning platforms, bouncing trampolines, and avoid obstacles like the giant, bouncy balls.

* Act 2: This act introduces the "Balloon" enemies. These enemies can hurt you, but you can also use them as springboards to reach higher areas.

* Act 3: The final act of Circus Zone is a challenging one, with more complicated platforming sequences and some tricky enemy encounters.

Let me know if you have any other questions about specific parts of the Circus Zone, or about Sonic 3 in general!