The HxB Gold Room is where the Hearty Heroes of Hauling meet the Vault of the Beamcasters. Solving it pops the Gold HxB trophy and opens up the Heroes and Light area beyond it.
The HxB gold room is split down the middle: the Beamcasters side with the blue beam on the left, the Heroes side on the right.
What is in the room
- Beamcasters side: the gem carrier, two gems and a blue beam.
- Heroes side: the priest, who cannot be hurt by goblins, and three goblins that all have to die.
The key rule
Goblins kill any monster standing next to them. If two goblins end up side by side they wipe each other out and leave the third with nothing to kill it. All three goblins have to be brought together on the same move, so plan that final move before you spend the beam and gems.
The source only describes the rule and the setup, not each move, so the video below is the reference for the exact order. If you get stuck, check that no two goblins can touch before the last move.
Solution notes adapted from the Postmode walkthrough video (PS5 Pro, no commentary) and checked against the footage. Press undo and compare with the video if a step does not match your screen.