There are loads of things you can do with the hold hand prop. We used this prop for our Forgotten Temple; players touch a rather creepy monkey skeleton on each side of the room - and once contact is made, a cove door "magically" slides open. We gave gotten rave reviews, and if you can hide the entrance efficiently - a ...
This could be one of my favorite props. In our case, players find a chess piece during the game. When the chess piece is placed in the correct position, the plasma ball lights up - players then need to hold the ball, chant a spell - and a magic door opens!
We saw a similar puzzle in Bangkok, in their case they had ...