The Blackbridge Grotto is a cave to the right of the mansion that you'll first notice when you see the sealed metal door. This door can be opened by solving a puzzle in the main Blue Prince house that fans of science are sure to get behind.
There's two parts to this puzzle, first is that you need to solve a riddle and then the second required you to draft a number of rooms to be able to input the solution of the riddle.
As with our other Blue Prince guides we'll try to lead to you the answer via a series of clues and a final solution. We've attempted to draft these hints in a linear order but not every part of this is linear.
Blackbridge Grotto Hints
Hint #1 - Opening Blackbridge Grotto has to do with the Boiler Room and the Laboratory
Hint #2 - A message hidden in the Table of Elements will let you know what to do
Hint #3 - In order to follow the hidden message the Laboratory needs to be getting power from the Boiler Room
Hint #4 - If you're having issues drafting the two near each other first obtain and power up the Boiler Room. If you draft a room from a powered door in the Boiler Room there's a higher chance that you'll draft a room that can interact with power. This will make it easier to get them together
Once you are in the powered Laboratory and have the decoded message you'll be able to follow the instructions and unlock the Blackbridge Grotto.
Full Solution
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