First make a house. Then make a tunnel that leads to a secret room. You can hide the tunnel entrance by covering stuff over it so that it doesn't look suspicious, like a bookshelf.
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First of all it SECRET and second the steps to making a secret door -Dig a hole in the wall -Expand the hole to your desire -Put a chest in the room -Put valuables in the chest -Go out of the room -Seal it with a different material then the wall -Put a painting over the sealed "secret room"'s door
The super secret settings puts on shaders which are changes on how the game looks. For example, if you press it it could make your world look like its on an old tv screen or upside down. To undo that, restart minecraft.
Right click where you want to place it, make sure there is enough room for it.
the secret room douse not exist but the secret places are the mine and the dojo!
I didn't make Minecraft.