Hard as H e double hockey sticks
I didn't play very long and didn't have too. Even on easy mode if you use all your chesse to send this huge army of mice the computer counters with a unit you don't have and plenty of them. 5 black rats would cause the computer to counter with 3 rats and 10 blacks would make a cat or cat/owl combo. That is just wrong and I nvr could kill a cat with even 6 rats wtf.
Glitches
Mouse traps don't work if you put them right next to your cheese.
Tacs and poison jars will fall below the screen if you use them under the ground like a hill.
Enemy mice can be flipped over your entire army if attacked just right.
Enemy rats kill everything before advancing even though their descriptions say they choose to eat rather than fight.
rats cost 25 cheese but it takes 60 cheese of tacks to kill just one.
If I can't find anything decent to play I will try again but as of writing this I have lost interest. it works though so I will give you credit for that.