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How to unlock the challenge stages and hidden puzzle in Serpent Starway (Astro Bot)

This video guide will show you how to find the hidden puzzle piece, as well as unlock all the challenge stages in the Serpent Starway if Astro Bot.

You can find the video below:

If you can’t get these to appear, then you should make sure that you complete all the main levels first.

You can also try exiting and then re-entering the same galaxy to see if you can get these to spawn.