Puzzle "Cake with clues" looks like a very large cake with painted letters at the very top. 
The cake shows letters after signal (operator or other puzzle). The cake cyclically shows one by one the letters, we need to make words from these same letters. 
With the help of these letters / words, players receive a hint, which they use later in the escape room.
The letters that this cake shows are programmable according to your request.
Size of cake: 60cm diameter, height: 37cm