Hidden Cube

A hidden cube is a block that is invisible, although it is solid and cannot be passed through. Like pumpkins, it can only be placed on top of blocks, not on the sides or underneath blocks, although this can be circumvented by placing blocks in order to place the hidden cube at its desired position and then destroying the other blocks. It is broken equally by all tools, despite its inventory image resembling a grass block. It can only be obtained by spawning it in.