The last puzzle I successfully completed was across the board. It is the 4th puzzle in the functions section. In it, I had to make a new function. I named mine, getGem. In that function, I made it go forward, collect gem, and then that repeated one more time. I used it 3 times throughout the level. Nothing was exceptionally hard about this level. I just had to use my new function, with turning and moving forward in between. Below is a picture of the level I did.