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Repeat Times Block
Immersive Reader

Try changing the numbers in the "turn" and "repeat" blocks to make different patterns. Or, experiment changing the rest of the code to draw anything you want.

Blocks
Workspace
random colorturnright ▾by90degreesmoveforward ▾by20pixelsmoveforward ▾by20pixelsrepeat4timesdoset colorturnright ▾by???degreesrepeat10timesdorepeat???timesdowhen runmoveforward ▾by100pixelsturnright ▾by90degreesset width1set colorrandom colorset colorrepeat4timesdo