To beat the last boss you use Heal ability, stun, Dynamite and shield if you use everything correctly you will end up juggling between your ninja and mage to finish the last bit of HP of the Panda off.
The final secret award is for completing the final level in 2 minutes, what I did was headed for the blue portal right away to grab the torch and collect all the gems that did not lead to the key behind that blue portal. I then went back to the red portal to grab the key and hit the switch. After that I went through the purple portal and finished that whole portal in one visit grabbing the axe while I was there, double back after the purple portal back into the blue portal grabbing one of your final keys and hitting the red switch. now just complete the green portal and rush back.
3 starred everything first round threw just by updraging barricades and archery first, then health regen on walls saved me mid match for a 3 stars :0 phew, I also read the top comment about the shotgun cannon combo and cried because I thought I was the only one using it :p
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