Mushroom revolution

2 Gem Combos:
Double Damage - Fire - R,W
Slow - Wind - B,Y
Splash - Earth - R,G
Confuse - Thunder - W,G
Life Plus - Wind - B,W
Wealth - Fire - R,Y
Poison - Wind - R,B
Stun - Earth - B,G
Geminate - Wind - Y,G
Machine Gun - Thunder - W,Y

3 Gem Combos:
Triple Damage - Fire - R,W,G
Splash Slow - Wind - B,Y,G
Big Splash - Earth - R,B,G
Teleport - Thunder - W,Y,G
Life Steal - Wind - R,B,W
Money Steal - Fire - R,W,Y
Splash Poison - Wind - R,B,Y
Instant Death - Earth - B,W,G
Plant Bomb - Wind - R,Y,G
Sniper - Thunder - B,W,Y

Don't forget though: pure towers can be upgraded a further level and don't have decreased damage against contrary colors.

Always try to place your Mushrooms where they will be able to attack a wave twice (at cross sections or between close parallel paths)

put your mushrooms where they attack twice, its the only way to win

Rather then building lots of weak towers just build afew and level them up as much as you can. It is alot more effective.

To pass through first 8 levels it's enough to use just pure towers. There are only few exceptions (from the list of possible non pure towers) - splash slow and splash poison towers. These two types are quite useful in every stage you play.

Use your Skill Points you get for a completed Level to get upgrades, so you get f.e. Element stones in the beginning, very helpfull.
If you upgrade it to 3 Element Stones try to get 3 different Element Stones. When you got 2 of the same Element, restart the game.
You'll find the Upgrades at the World map.
And it's really no joke, build pure Towers xP

Hab es erst mit den verschieden farbigen Türmen und ihren verschiedenen Sonderkräften versucht, aber besten geht es, wenn nur reinfarbige Türme gebaut werden. Die können noch eine Stufe weiter ausgebaut werden.

Use pure thunder and water towers.