In an escape room the way out is a puzzle, so dream books read it as a problem you must think your way through, often against the clock. It can also stand for teamwork and shared pressure.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.