A 50-50 percentage test! I wanted to see how accurate Scratch's "Pick random" block is, so I did a test. Mathematically, if it was completely perfect, it would be 50% white, 50% black, but that's almost impossible. So, with the test, out of the 42960 squares, around 49.9% are one colour, and 50.1% are the other. Pretty accurate, Scratch!
Turbo mode please; It takes a LONG time to stamp all the squares.