Loved the music and that cute mice character :) There is really hard to find the difference in some cases. I failed to find one like 5 times in a row for a particular kind of cheese (attached). But got lucky after all, so - happy end :)
I got it now - it's the color of the cheese's side :) But the form of the cheese is kind of confusing. I'd say it's number 1 for sure if i look at the cheese form