grid.js

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numx = 3
size = display.width / numx
numy = Math.ceil(display.height / numx / size * numx)

repeat(numy, (y) => {
  repeat(numx, (x) => {
    let r = display.rect(
      (x*size)+size/2,
      (y*size)+size/2,
      size,
      size
    )
    r.color = color.hsb(random.num(0,360), 42, 92)
  })
})