Note: If you can beat level thirty, I promise you can beat the game. It's the hardest level by far. I know you all can do it. It just takes patience and analyzation skills.
How to get ridiculous amounts of health in just a few steps:
1: Be a controller
2: Equip Elf Hermit and Rejuvenation (found in the earth slot)
3: Battle Helga the Whale (in the campaign)
4: Fill up your entire side with Elf Hermits
5: Place one Ancient Horror (found in the control slot)
6: Use rejuvenation every turn. The ancient horror should make it so none of your hermits die.
7: Enjoy!!
A good way to get your levels up faster is to find the game that levels you up the fastest, die as quickly as possible in the other two, and keep playing that one over and over again.
The accuracy test is really hard when using automatic guns because I keep shooting twice. It would really be nice if you could set them to semi-automatic during the accuracy challenge.