Be ready after you say "yes" to the first question. The cat will flash red, green, yellow or blue a certain amount of times, increasing as you go on, and you must type the code of colors that were flashed after each time (i.e. RGYB when the cat flashes red, green, yellow, then blue).
The number above the cat represents the amount of times you can get it wrong. After you type in the correct code, the cat will speed up, and then after it gets fast enough it will reset its speed and increase the amount of colors in the code by 1.