Hard badge - you must use all three types. Use up to four skeleton camps but there's no need to upgrade them aside from extra skeleton. Have two block one path and two block another path. They're just there to slow enemies down so you can chain lightning and fireball them. Archers to cover one path and Pools to cover the other side. Buy the 100 gold buff towers only after the first wave. Archer side is pretty much autopilot after you have two buff towers and upgrade them periodically - just use poison towers and the poison ability. Weaken ability is useless. As for pools, you want mind control. Build two mana stealing towers - three diamond stars are relatively easy as long as you use 1x speed and spam all three spells. Consider building an Archer tower near the Pool side if necessary (but still within range of the buffing towers).
So the game bugged and froze...but my multiplier kept increasing and score kept increasing. Now I hold a 4100 multiplier on the high score table. No idea how to reproduce bug, but it's there.
Defeated the last epic stage. Here's how - get a lineup of all melee units. Titans and healers are optional (speed is essential, and if he hits you, no healing will bring you back). As soon as your heroes are on the battlefield, charge ahead. They key is to get all your melee units (tigers, goblins, valkyries) between the boss's legs. The boss can hit your base from across the battlefield, but he can't reach under. So to speak. You need to try to stay within the safe zone (or the sweet spot) but still manage to hit the enemy castle. Don't try to kill the Yeti. Whenever you have mana for shield, use it and bring more melee units between his legs. Good luck!
Wow, in later levels the game is simply trivial; just stack three massive cannons onto a single small bubble - 300 damage (equivalent of 300 basic cannons) every few seconds, and your armor ensures you will survive until you line up a perfect shot. Be sure to space out your cannons somewhat so small enemies will get hit, making this even more trivial. 2/5
Game crashed for me; I have been on Kong for a while and this is the first time. But in any case the game sucks in the last levels, since you are always outnumbered and outgunned, making you wait around for the one single lucky protein spawn, which invariably never happens since there are 5x of the enemy and they will always get to the spawn first. Then you'll have to wait for viruses to spawn. Did I mention the enemies which don't get infected? Good luck. 2/5