In this article, we’ll show you exactly how to solve the Underpass Box Puzzle step-by-step, so you can open the box and keep exploring without missing a thing in the game Blue Prince, released on 10th April 2025.
How to Solve the Underpass Box Puzzle
The Underpass Box presents a 3×3 grid of colored tiles. To open the Underpass Box in Blue Prince, you need to change the color of each corner to match the color of its Realm. For example, if a corner symbol has a particular color, then corner tiles should be of the same color.

Underpass Box Puzzle Solution
I’ve marked all the 9 color tiles from 1 to 9. Below is the solution that players need to press tiles to change the colors of the corner tiles to match the color of their Realm.
5,9,6,6,7,3,2,2

Underpass Bedroom Box Rewards
Solving the Master Bedroom Box gives you an Allowance Token, adding 2 coins to your daily budget.