The cat will pick a random number. If you can't find it on the list, click "No" and the list will be halved. If you found it, click "Yes" and you'll have to say what position the number was in. For example, if the number was 3, and it was the 5th item in the list, you slide the slider to 5. There might be a slight delay when you slide it to the correct position and when the win screen will appear, so be patient.