Rainbow Challenge

Here's an excerpt from Rainbow Challenge's itch.io description:

A puzzle challenge by Niv, with respect for Parachor and Wizardoffail. You do not need to edit the spreadsheet to complete the challenge.

These puzzles are presented with no explicit instructions or objective. That might be to your liking, especially if you have experience with puzzle hunts. Otherwise, highlight the lines below for optional information on how to get started

I made this puzzle challenge to scratch an itch for puzzles in the style of Wizardoffail and Parachor, creators of Ultraviolet Puzzle Challenge. They started making puzzles in isolation from the wider puzzle hunt community, resulting in a unique style epitomized by colorful, wordless, pixel-art diagrams. Here, I tried to pay homage to the visual language of their puzzles and avoid many of the idiosyncrasies that make puzzle hunts less accessible to newcomers.