1. Cata spot: archer reduce chances of getting hit by archers. The bridges could save you and the cata from bombs by small about of chance.
2. Stair formation: Archer will hard a hard time to arrow jump. Good for spot that doesn't have much trees.
3. Spike: prevent some jumper that could slash you.
4. Stone: Slow down diggers and support the spike.
5. Archer won't have that much chance of a perfect arrow jump to get over.
Resources:
+620 Stones (can be reduce if use less backgrounds)
+800 Woods (can be reduce if only use 2 doors on each floors).
Tips: Build this tower after the game start, you will get a ton of coins =D
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