"Light up your base with pretty glowing lava flooring. (Doesn't kill)"
The Lava Flooring costs $245M per tile when bought in the shop. Like all flooring, it's "hitbox" is actually 1x1, although it is 3x3 in physical size. The Lava Flooring is among the favorite floorings along with the Unobtainium Flooring because of its coloring.