Keep this post alive! Build guns in order, preferably close to each other: Machine Gun, Frost Tower, Sniper, Cannon, Machine Gun, Poison. Upgrades, in order (go 5/5 on one before going to the next): Skill (skull), Auto Up (XP), Frost Tower, Cannon, Cash Collecting, Damage, Poison, Gold, Fire, Shock. Once you have built your six towers, focus on upgrading reload for all guns except frost. If your cannon is near the frost tower, you will obliterate almost every wave. By the last wave you should have 8 reload on every tower (but frost) and almost max range on cannon and sniper tower
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