The color purple will help narrow your search

Look for this one in the Color Swamp

It is on the swamp floor, formed from purple shapes.

Starting from the obelisk, head down the path that leads to the summit. Stop when you reach a rock outcrop overlooking the purple portion of the Color Swamp. There are a couple yellow platforms here that can be moved by solving a panel puzzle nearby/below.

This one is only accessible while the platforms are moving. So the trick to obtaining this solution is to solve the panel in such a way that it allows you to get back to this vantage point again before the platforms stop moving.

First, solve the puzzle with the solution that will allow you to access the panel from the mountain side of the swamp. Next, re-solve the puzzle with the platforms in the other positions. As soon as you've set the platforms in motion, scurry back up to the overlook and quickly light up this puzzle.

One more thing: There are two more environmental puzzles in this same location, each requiring the platforms to be in different positions. Before moving on, you might want to play with these platforms until you uncover all three.

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This puzzle will be covered until you set things in motion

Not very close to the obelisk, but not very far either

Should only take a short hike to get there

The exact location of this puzzle might be described as a bit murky

To see this one, you'll need to look down on it

Solving this one won't require DEEP thinking