Explosive Cube is a cube in Portal 2 Episode 1. Each one has a variable time, and when the time counter reached the end, the cube explodes. This cube is specially made for quick-thinking tests and time attacks. The rest of the cube is the same as the normal cube. Note that this cube will only work with special buttons, called "Quick Button". The Explosive Cube and the Quick Button are made to work togheter on time-limited tests.