Next time you should include some details on where you are stuck or confused, so people know how to help you. I would have loved to give you some advice, but without you sharing some details it’s impossible to guess what you’re doing wrong.
NOTHING is impossible, Koichi!! …Ok, MANY THINGS are not impossible!! :D MAYBE even the Cheetah thing …if you were an insanely quick thinker :B …though, I probably wouldn’t test this theory out in reality… So, yeah… what you said, there, yeah.