For level 20, all you need to do is solve the level for 4 speakers. You will end up with two extras arrows. Only small changes are required at the bottom part to accommodate the fifth speaker. If you are still stuck, just solve the right bottom part separately.
Although short, it is a nice fix for those who played the prior games : Temple of The Four Serpents and Amidst the Sky. If you loved the Warper or Duality of Opposites, you would also love it. It is from the same developper ! :-)
Done hunting. Dragons and a few spiders left. I'm fighting a City with Dark Mages at level 43 and can't win. The Mages heal each other and send spiders. Whenever I kill one, there's another one that comes. The whole street is filled with black flames and the battle won't end. For my part, I too have healing mages that send spiders. It's get boring watching how mages send spells at each other. Any tips on how to unbug the battle?
Basic Gun proves to be incredibly effective against Goliaths due to its big ammo capacity (half health in each burst). Shotgun any Bomber as soon as it enters the screen. Even when the bomber jumps to your dome, you still have time to kill him with shotgun.
Rockets kills instantly a mammoth when it's in his firing position.
Replay the game if you fail a wave because the money is not returned for purchases like ammo.