Personally I just finished the low lv challenge and I have to say after getting the firefly it wasn't really that hard, just time consuming when you had to gain extra Gil and LP. I did 90% of the hunts with lv1-3 chars, and even aquired Turnesoul in that game.

Mimic queen, Vossler, Tiamat were propably the toughest bosses but all bosses/hunts went with 1-3 tries. So anyone else done this challenge?