You need to get the kitty to the house. To do this you must use your mouse to 'draw' a line to the different platforms. The kitty will travel along these lines to get to the different goals (keys to open the house and such). The thing to remember is that a line does NOT to to be completed for the kitty to begin to traveling on it. But you must complete it before it reaches the end of it. Good luck, once you get the basic idea/hang of it, it's hard to stop playing.