Blue Prince, the critically acclaimed puzzle game from Indie developer Dogubomb and publisher Raw Fury, has almost as many puzzles as it has rooms. This will come as no surprise to most, probably anybody reading this guide, but there are several rooms you will want to revisit on your quest to find the mysterious 46th room. One of these is the Billiard Room, where you want to solve the math puzzle on the dart board 40 times to unlock the “Bullseye” trophy/achievement.

Once you understand the rules of the puzzle, it will only be a matter of runs before you reach the requirement, as it can only be solved once per run. With all that said, let’s break down this puzzle and get you the “Bullseye” trophy/achievement in Blue Prince!

The first step is to reach the Billiard Room. Unfortunately, that is down to chance, as the blueprint for that room needs to be drawn so that you can pick it as the room behind the door you’ve selected. Once you’ve made it there, that’s when the puzzling begins!

Interact with the dart board, then highlight and interact with the number on the board with a blue segment. This will start the puzzle.

There are two rules to this puzzle. The first is that four colours represent four different mathematical equations:

Blue – Addition (+)

Yellow – Subtraction (-)

Red – Multiplication (x)

Purple – Division (÷)

The second rule is that from the centre of the dart board, the bullseye, out to the edge, is the order in which you perform the math equations with the adjacent numbers. (Technically, you can look at the bullseye as zero (0), since each equation starts with adding the first number)

For example, the solution to the problem above would be:

3 – 1 = 2
2 x 15 = 30
30 ÷ 3 = 10

The puzzle involves solving several of these math equations that progressively get tougher. Once you have solved the puzzle, you will be rewarded with the contents of the drawer below the dart board.

Now all that’s left to do is solve this puzzle 40 times, and you will unlock the “Bullseye” trophy/achievement in Blue Prince! We hope you found this guide helpful, and be sure to check back for more guides for Blue Prince, as well as a review of the game.

Here is our Blue Prince: Beginner’s Guide, covering the fundamentals of the game.