Thanks for a quick reply!! I did not think about having the electronics in the maze, it would possibly make more sense.
I would make the maze on a sheet of ply then construct a box over it!! So the kids could not see what they were doing, so need to rely on sound!
If i used some type of switch around the mine (LED) would it be possible to have 30 of these in to one micro controller that when activated cause the beeping to start and stop of the switch is deactivated?
I have just thought that i could use light sensors in the maze going in to the micro controller and have an LED on the under side of the vechiel, the if it gets activated the explosion goes off... Or would i not need a micro controller for this just a simple circuit?