To beat the secret mission is actually quite simple. The level has 20 levels, the first 5 levels have pretty simple guys to beat, like goblins. The next 5 levels have a few archers and a few guys with shields. The next 5 have a few Urah-Kai, Archers, and shielded guys. And the last 5 levels have lots of Urah-Kai archers, Urah-Kai, shielded guys, 3 cave trolls, and 4 forest trolls.In the last and hardest level in the secret mission, you have to beat Urah-Kai, 2 forest trolls and 1 cave troll at the same time! To do that, kill the Urah-Kai first. Then shoot the cave troll with axes or arrows, and then to kill the other two, go up to them( they will be in a group) and let one of them smack and kill the other one then run circles around the remaining one and when it try's to attack you move out of it's way and attack it , then start running again.