1000 EUR
As the game progresses, players find a UV flashlight. If you shine it on the fireplace, you can see a palm print on its surface. Players need to put their hand on this print and then the hiding place in the fireplace will open.
This puzzle can be changed and reprogrammed based on your task. Possible to open magnetic locks, activate another puzzle, play music, turn the light on/off. Just let us know about it to calculate additional functions.