ok i just beat cave 5 having only played through once as the red general, then beat it while playing the blue - just invincible at the castle and the goblin blows over your army, then he just attacks one goblin at a time walking towards your end, its enough time to blow up the castle and win. only used one freeze spell at begining (level 3) and one invincible spell (level 3). crazy
whiteace - you need to beat it through using different generals. beating cave 4 is pretty simple, just retreat after each anger wave and deal with the boss then go back to the castle.
Great game, I loved the first two but this one is now my favorite. I like the card system which allows for some great strats. Goblins and Dwarfs rock, tear down a castle before any back up waves even get the chance to come out especially when timed with a phoenix, ice trap and lightning and invincible!! anyways Great Game!!