We can use invisible ink to write each letter of GHOST at each station. Make Invisible Ink To Write and Reveal Secret Messages: Iodine solution reveals invisible ink messages written using corn or potato starch.
My Friend & I Want to Have Escape Room Nights Once in a While. One of Us Will Modify a Room in His House with Puzzles and Riddles and All the Others Will Try to Escape. What Are Puzzle Ideas for Real Escape Rooms?