There are, as usual, three levels of dificulty.
novice
For those yet untested in battles, that yet have to prove themselves. Only integers up to 100.
You've seen some battles..so what!? Back into the battle! Sometimes you have to count the losses. From negative to positive 10.
Tough guy arrn't you! Ok you got my attention boi. Just like last time, only upto a 100.
pro
Skills are not something that you lack. But you still need a lot of experience. Up next, floats from 0 to 100.
Continue like this and you might become a man someday. Negative and positive floats. Do I see hairs on that gentle face?
Slow down brother! You've proven your point..unless you want to be the chief soon. Arithmetic with numbers from 0 to 99.
expert
So beard has grown, you earned your first horns..but you're far from a chief. Serious stuff starts now. Arithmetic from 0 to 999.
No more mister nice guy. Full bank accounts and you have to answer: Sir, yes Sir! Can i have some potatoes with that? And no you can't!
Chief, some people are here to see you. They would like to see your famous skills and have traveled far to do so. Bank accounts, swift codes and all kinds of stuff.