the highest I've seen is level 2,417
Get the highest level ninja and weapons. Along with as many ninja as you can get.
level 21
I think its level 15
never knew there was that function, but i assume your friend can not be a sensei on ninja warz. - level 101.
Level 5 according to the wiki
how to get the teddy bear in ninja warz
How I Can Get Amethyst Mason For Ninja Warz!
Yes. People have played Ninja warz
i created ninja warz
Level 31 is your first black belt
631/2
someone above level 19 has to gift you