This video walkthrough will show you how to get the hidden puzzle as well as unlock the challenge stages of the Tentacle System in Astro Bot.
If these don’t show up, try beating all the main levels of the galaxy. You can also try exiting and then returning to the system.
You can find the video below:
Time Stamps:
0:09 Getting the Hidden Puzzle and Challenge Stages
1:33 Retro Rampage 2
2:21 Crumble Rumble 2
3:11 Cut ‘N Grind
4:12 Dashing Dillo
6:07 Pumpkin Peril
7:30 Fragile Frenzy