Cobalt Plateaus - 12

Wave 3
The player has to engage 1 Brute.

Strategy
Wave 1:

You have to fight 2 Stick Pigs and a Rogue. Just attack the pigs every turn.

Wave 2:

Same as Wave 1. Be careful though, Bird Catcher might stun one of your birds.

Wave 3:

It's just a brute. Defend using Red's secondary skill when the Brute is about to attack. Otherwise, just repeatedly attack the Brute.

In Summary
Lots of Common Pigs will appear in this level, so it should be easy.
 * Wave 1: Rogue is more powerful than the Stick Pigs, so defeat him first.
 * Wave 2: Bird Catcher can stun one of your birds, so he should be the priority.
 * Wave 3: Brute can deal BIG damage, so just beat him as you would before.