If you don't have the extension, then use the "Clones?" Variable to see how many clones of the cube are in the project (actually shows 50, but in clones? is 49). Adjust the sliders to mess with the cube. I tried to add customizing but it was harder than I thought.
Big thanks to WojtekGame for the original project and code that I modified. Credits to The Caretaker for the song.