How to Create the Most Compact 2x2 Hidden Piston Door in Every once in a while, Minecrafters want to create a simple hidden piston door to secretly hide all their valuable items. Now, it's possible with only 18 redstone, 2 repeaters, 12 sticky pistons, and ONLY 20 blocks of any kind! My personal record for building this is 35 seconds! Think you can beat that?Author: Kurt Foster Easy, COMPLETELY Hidden Minecraft Piston Door: 4 Steps Easy, COMPLETELY Hidden Minecraft Piston Door: This door is very fun and very easy to make. A hidden door just pops out of the wall.