Some games don’t require a manual. They won’t bring out your inner rage, send you searching for answers online, or require you to ask your friend for help. Instead, they challenge you quietly, providing a gaming experience that’s equal parts difficult and soothing.

Polycolor is the epitome of the relaxed puzzle genre, a game so basic that it requires almost no explanation. Here’s why: all you have to do is fill in a pattern so that none of your three colors touch one another, yet the picture is fully colored. You select either red, blue, and yellow, assign it to a shape, and work your way toward a piece of art that signifies your accomplishment. As you continue in the game, you’ll be restricted to only a couple of moves to complete the task.

For an example, take a look below.

Although the premise is simple and early levels don’t pose much of a challenge, polycolor has grown on me as I continue to work through its 70+ levels. It’s a game that requires little physical effort, but increased mental exertion while progressing. Still, I’ve found that it’s perfect for tapping away during moments of boredom or peace.

If you’d like to give polycolor a try, you can download it in the App Store for $0.99 (universal).