CC: tofu3

-- tofu3
--  put blocks in the form of the square

turtle.up()  -- move up

-- make 4 sides of a square
for hen=1,4 do
  -- put 4 blocks in the ground
  for i=1,4 do
    turtle.forward()  -- move to next position
    turtle.placeDown()  -- place a block
  end

  turtle.turnRight()  -- turn 90 degrees to the right
end