Invisible Harp

Players are in the mage's room. There are a couple of instruments fixed to a table, with their names written on labels. There are, for example, the Mystical Flute, the Magical Bell, and the Wizard's Cittern (they don't have to work properly). The Invisible Harp, however, seems to be missing. The catch? It's invisible (and there are Optical Tripwire sensors hidden in or underneath the table)! When players try to play on its invisible strings (so their hands will cross the sensors' lines of sight), the instrument plays a note. First, players have to find the Harp's label (with an RFID tag) and place it in the correct spot. Then, the short melody is played. Players have to recreate that melody to solve the puzzle, activating UV LED lights in the room. Electronics needed: 🎼 Invisible Harp puzzle idea, ✨ UV Lights output set