Just watch. Laggy, if you wan't it to not be laggy, Go inside > Edit only block (in color picker) > Run without screen refresh > Turn it off. Don't change special block otherwise it will bug, because its impossible to put a repeat until into another one without it repeating once. It basicly pixelates scratch cat with pen.
This was done using griffpatch get color value at point tutorial: https://www.youtube.com/watch?v=aBTh756kCZw&t=681s
