itch.io

No worries!

It's a common practice in rule discovery puzzlebooks that there is one unique solution to every puzzle. The Domino Lockpicking Company does not have this restriction, and some puzzles have multiple solutions.

However, this does not mean that guessing is required. Guessing is never required to finish the book. Here is an example:

In puzzle 1, you are told to select a number between one and five. This "puzzle" has 5 different solutions, all equally valid. As such it has multiple solutions but does not require guessing.
In puzzle 2, you are told to guess the number I am thinking of between one and five. This puzzle has exactly, one solution, and requires guessing - there is no way to know what number I am thinking of, you have a 1 in 5 chance of getting the puzzle correct.

Aside:  if I had to redesign this puzzlebook, I would have ensured every puzzle had exactly one solution.

"multiple solutions" and "guessing is required" are slightly different things...

Thanks for the feedback. I intend to make a digital version of this with tweaked rules as I agree that the rules are too loose in paper form.

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Row 2 only has 8 pips in your solution but it needs 9. If row 2 said 8 then your solution would be correct.

Looking at this again this is a valid alternate solution, nice job. Idk why I didn't see it earlier. However, as it has the same underlying numbers as the intended solution, it doesn't break the puzzle. I'd still prefer if the exam had a fully unique solution but I'm happy leaving this alternate in.

The Domino Lockpicking Company thanks you for pointing this issue out. We apologize for the inconvenience and have updated the exam for future interviewees. Your attention to detail has been noted.

What is the triangle doing here? The fourth column is the problem with this solution.