The Leveling Block is a creative/adventure item in Astroneer.
The Leveling Block is used to create uniformly flat surfaces, aligned to the voxel grid of the planet. This allows players to create surfaces, also known as true flat, that are smooth with no ridges or bumps.
To use the Leveling Block, place it on a surface and press F on PC. This will pop the block up and create a flat cube of terrain underneath it. If the player holds right click on the block, they can continue to press the use key without needing to move their character.