Secret Agent's Bookshelf

Players need to find a way to open an entrance to a secret room. To do that, they need to trigger multiple sensors hidden around the room. On the bookshelf, there is a small red button behind one of the books that need to be pushed. Also, the spines of the books have numbers and when they are arranged from the smallest to the tallest, they form a code for a numeric keypad placed on the side of the bookshelf. In one of the books, there is a couple of pages cut so it fits a special card (RFID card) for the slit on the top of the bookshelf (Card Reader sensor). And the last sensor – after players take all the books off the shelf, there is a vaguely visible handprint (Hands and Body sensor) – they just have to place their hand on it. The order of triggering the sensors is not important (Universal puzzle controller's 4th mode). After all the sensors are triggered, the electromagnet is released and a secret passage opens. Electronics needed: 👇 Small Red Button sensor, 🔢 Keypad sensor, 💳 Card Reader sensor, 🤚 Hands and Body sensor, 🧩 Universal puzzle controller, 🧲 Electromagnet output set