I can't get past Challenge Level 10. What should I do?

It is much easier to get past level 10 once you've unlocked skill upgrades. In order to unlock skill upgrades, you must obtain Perfect on all monsters in a level, which will get you a skill point for that level. In order to get Perfect on a monster, you must defeat it before its health resets (i.e. the stack of numbers collapses).

Please email me if you have any other questions!