You just do 3 things.

1 Merge same level cats manualy
2 Place cats in box
3 Save the cheese :)

【Details】
Merge the "MOUSER" (the cat that hunts the mouse) and protect the cheese!

◯Merge: Merge cats of the same level to raise their levels! As the level goes up the cat's attack power gets stronger and stronger.
◯Get Coins: Buy a cat with the coins you get for defeating enemies! You get coins while offline and you get coins for watching ads!
◯Unlock cats: there are many patterns of cats you can buy in the shop or merge to get! Let's unlock everything!