Build a pyramid as tall as you can. Only use 2 x 4's. Here is a hint that might help you: Build each layer of the pyramid as different color. This will make it easier to see the levels. Start at the top of the pyramid. Every time you need to move down 1 level click the Y axis down 3 times.
How high can you build your pyramid? Build as high as you can until the end of the period.
