Press the green flag to start. Place your mouse-clicker above the Scratch cat. Then, move your mouse along the white path. When the cat touches the home button, the game's over and you win. If the cat touches the green or blue before it touches the home button, then the game's over and you lose. Don't tell me that it's impossible, because I did it before, and I already get enough notifications.
(This isn't related, but I would appreciate it if you follow @Dragonlord_Hyperion. )