I set random squares all over a room to click when you stepped on them. Every time somebody stepped on them they would here a noise as if stone grinding on itself. The entire room.was covered in a darkness spell so noone could see .anything. They spent alot of time trykng to find all the trapped squares until they just heard a non stop grinding and a clicking noise. they ran across the room as the clicki ng got louder and faster. wheb they finally reached the end of the room they stepped on a square and the room brightened. it was just a square room. all the trapped squares did was activate ghost sounds.