Safecracker: The Ultimate Puzzle Adventure Hints

What do I do with the thing in the safe?

  • 1 of 3: At first glance, this seems like a very confusing letter. What does "8 mm under the upper limit of a Buttercups color" mean?
  • 2 of 3: Where have you seen colors associated with numbers?
  • 3 of 3: It's a clue to opening the colored light safe in The Workshop.