Sulfur Fusion: Cubes should be able to stick together

Sulfur Cubes should have the unique ability to "stick" to each other. When two or more Cubes collide, they should fuse into a larger cluster. This cluster moves together and combines its explosive power. If one Cube in the group is carrying TNT, the whole cluster becomes a massive mobile bomb! This would make them a much more formidable and chaotic threat in groups.