This comes a little late, but I'll reply in case someone else is stuck at the same spot.
I don't think there is one right code to solve that. Different color takes the hook to different direction. I can't remember the directions now (you have to use trial and error to find out) but if we assume that blue = left and green = right and that you have to go seven right, it doesn't matter whether you hit seven times green or ten times blue and seventeen times green etc.
I'm sorry I can't give an exact code. It's lots of fun to try and find the right combination on your own when you realise how the machine works, though.