My name is Case and I am a fourth grader.
I did the Robotis Play 503, the project on page 1 - 13. I modified it a little with four big pieces and four orange pegs, resulting in it going backwards - faster than it did going forwards originally. I switched the head and the tail around, moving the tail two pegs upward, so it doesn’t cover the on/off switch, and now it goes faster and it’s taller. I also added a smile to the face with the black pegs I had left.
I am attaching two pictures so you can see what I did. I thought you might like to add this option, which would add only four more steps.