As you explore the mysterious mansion in Blue Prince, you're going to find the dartboard puzzle pretty quickly and pretty often. Located in the billiards room, the dartboard contains a math puzzle that isn't easy to solve unless you've worked out the rules.
You'll want to get good at the Blue Prince dartboard puzzle since it'll come up just about every time you play. The billiards room is one of the most common rooms to draft, and solving the dartboard puzzle provides you with keys: usually normal keys to unlock doors, but sometimes special keys you'll only find once in a while.
