Through listening to see if the 'spy' can catch the 'target'
One Beaver scout is blindfolded and sat on a chair - with a torch.
The other Beaver Scouts are sat quietly at the other end of the hall.
Each child (when told to go by a lader) tries to creep down and pinch the keys without being caught.
If the 'spy' thinks they hear something - they shine the torch in that direction.
If caught - the 'target' returns to the start.
If they get the keys - the 'target' becomes the 'spy'.