Press the space key to advance to a curve of the next order. This project uses an L-Writing System to generate the curve. It can go up to at least order 13 psudo-Hilbert curves. I haven't tried going any higher due to the long loading times. I strongly recommend turbo mode, which you can activate by holding shift while clicking the green flag. The instructions for curves with order above 8 often take a while to generate. If the variable counter is still counting, the program is running, it's just taking a bit to generate the next curve. Length is an estimate for about how large counter will get before beginning the next drawing.
This uses an L-Writing system to generate the instructions for drawing the curves.