Lovely Craft Piston Trap Dungeon Extra Quality Official

Within sixty seconds, the corridor is clean. Dry. Silent.

Place an observer facing into the hallway leading to the trap. When a mob or player walks past, the observer emits a redstone pulse. Run redstone dust from the observer to a (a repeater loop) that keeps the pistons retracted for 4 seconds, then extends them. lovely craft piston trap dungeon