There may be time in which you want to make a quick escape from enemy mobs or players, but besides escaping the scene, you also want to make sure your enemy cannot come to you. The thing is able to be achieved very easily.
The style of the hidden door in this article is really useful and is really quite simple to make. This one requires 2 redstone repeaters, 1 redstone torch, 6 redstone dust, 12 sticky pistons, 1 lever, 4 door material, 1 previously existing cave or mountain or 20 wall blocks.
Step 1: Add Pistons
Build a 2×2 square of sticky pistons. They should be sticky or the door will only open once and never close. Add a 1×2 column of sticky pistons at 90 degree angle to the 2×2 square of pistons. The path these pistons face is the path the doors will open or close.
Step 2: Add Your Door Blocks
You can add the material that you want to end up being your door in the space touching both sets of sticky pistons. It can be any block that is able to be slid.
Step 3: Wash, Rinse, Repeat
Please repeat the step 1 and step 2, but mirrored and 2 blocks apart. Keep in mind that the two empty space blocks are where the pistons will extend into, so do not build anything here.
Step 4: Build a Wall
Make a wall to hide the pistons. The wall should be a minimum of 6 blocks long by 4 blocks high. Please leave a 2×2 square empty in the middle for the door.
Step 5: Wire It Up
First, make a little loop. Then, add two repeaters, facing outwards. Next, add redstone dust on the rest of the loop. After that, add a redstone torch to one of the two blocks above the door. When it is done, go to the front of the wall and put a lever on the same blocks as your redstone torch.
Step 6: Choose a Location for Your Secret Hideout
Feel free to explore your Minecraft world until you find a place that suits you best.
Step 7: Dig It Out
Dig out enough space for your door. You can start by digging a 2×2 hole 3 blocks into the mountain. Then, dig out two 2x2x2 recesses in the sides of the cave. After that, dig up 2 blocks in a 4 block channel. Next, hollow out a 2×6 space in the topmost part of your cave.
Step 8: Add the Redstone
Add two repeaters. After that, add redstone dust around the rest of the hollow you made before, connecting all of the components.
Step 9: Add the Pistons
Add 2×2 sticky piston squares in each side of your cave. Then, add 1×2 sticky piston columns attached to the previously built ones.
Step 10: Add a Redstone Torch
Step 11: Add the Door and Patch the Holes
Step 12: Finishing Up