Supraland

In order to find all the red moons, you will need to be able to melt metal in order to find one of them. In order to do this, you need to find 5 of the secondary fire damage upgrades bringing your damage up to 128. These upgrades can be found in the 1st video below. Take note that in that video, the 4th of the 6 upgrades isn’t actually a secondary fire damage upgrade but a combo damage upgrade instead. Once your secondary fire does 128 damage, you can follow the 2nd video to find where all 6 of the red moons are. Once you have them, you want to place them on the rock near the front gate to Blueville which will reward you with the Super Sword.

All video credit goes to the Game Guides Channel.

Secondary fire damage upgrades

Red moons