Code Sketch

def square() {
    setPenColor(randomColor)
    repeat(4) {
        forward(30)
        right(90)
    }
}

def ladder() {
    repeat(10) {
        square()
        forward(30) // Moves up to the next rung
    }
}

clear()
setSpeed(medium)
setPenThickness(4)

repeat(10) {
    ladder()
    hop(-300)   // Move back down to the bottom of the column
    right(90)   // Turn right
    hop(30)     // Move over to the start of the next column
    left(90)    // Face upward again to prepare for the next ladder
}