Minecraft wiki entry for Secret_door, associated text: This is among the simplest hidden doors as it does not require any special items or tools. Additionally, it can be completely hidden as it has a manual opening mechanism. To make the door, first find a location that is not a likely mining spot. Next, break a hole in the ground or a cliff side. This hole is the entrance, the broken blocks the door. Remember to 'close' or patch the hole or else others may see it.