This page offers a guide on the hidden level Dreadnought’s Garbage Dump in Dreadnought Galaxy. This hidden star can be found in the Revenge of the Topman Tribe level.
Helping out Gearmo
You’ll start the level by landing on a UFO. To get to the hidden star you need to head to the underside of the UFO, where you’ll see a Warp Pipe. The Warp Pipe will take you to a platform with a Gearmo along with piles of trash and Bomb-ombs spawns.
Speak to the Gearmo who will ask you for help to blow up the trash. Say yes and you will have 30 seconds to blow up the piles of garbage by throwing the explosive Bomb-ombs. Destroy all the garbage before the timer runs out and the Gearmo will give you a Power Star.