Light bulb

Light Bulbs are an item in Through Abandoned: The Underground City. There are four in total.

Light Bulb number one is in the miner's cabin under a cover that can be removed with the screwdriver.

Light Bulb number two is in the cube.

Light Bulb number three is inside the cube hologram.

Light Bulb number four is next to the special brick.

They can be placed in the light bulb containers, giving a code.