Subterranean Block

This mod adds a block item that you can place anywhere, allowing you to build absolutely whatever you want, whether its's a massive castle, or a series of underground tunnels, or a recreation of Atlantis.

Two warnings here. Once it's placed you can't remove it, so save before building, also, you are able to accidentally place a block on the same space as an existing block, therefore just wasting one.

My code is completely free to use, if anyone wants to make an expanded version with more tile options.