2800 EUR
On the lid of the stone well, you can see 5 recesses for pegs. You need to hammer all the pegs into the wooden lid with a hammer.
The well will seem intimidating to the players, since in the process of hammering each peg, the lid will jump due to the compressor, as if there is a monster there and trying to get out. When all 5 pegs are hammered into the lid, the lightning effect and additional sounds will work, as well as the speech of the demon will sound from the general speakers.
If everything is done correctly, the lock will open or the next puzzle will be activated.