If this works as well as it did for me keep this comment alive, as well as add me and become a fan :) I can beat pretty much all tower defense games without too much difficulty
To complete missions and get expert simply just go through the game and come back to the really beginning ones with your upgrades, so you can place a super tower and send all the waves at once.
Actually, the very very easiest way to win missions is simply upgrade your initial money until you can afford a super tower at the very beginning, then keep upgrading the first section of upgrades, and completely forget posion,frost,or bombs, or the fast or the basic towers, you only need super towers.
LOL i beat level 1 no sweat. then went straight to level 18. Just saved up for golden finches. Upgraded fully and bought another, then upgraded, until I bought 7/7 finches. X[) the dears and dogs die in less than a second then.
How to get up to wave 30+ Most of the primary weapons are just useless expensive weapons, so instead by one of the cheapest primary weapons. After that buy a delta sniper, once it dies dont buy another one. The buy a vest, and after save up on a few grenades and lots of air support/strikes. When the cars appear use a grenade to blow them up and shoot the rest of the guys. Once you start earning 5000+ money each round just use air supports to destroy the cars and everything else. Finish off the few guys left that survived the air support. Repair your helicpoter whenver. I suggest repair even like 50 health b/c the repairing gets more expensive as you go. I got to wave 28 doing this, but died because I bought the cheapest vest, and ran out of ammo.
I really don't see why everyone sees why this is such a bad game, i mean, world of warcraft is etter, because u have to pay for it! Lots of people dont like this game but the graphics r better than flash games!
Went on Freewebs and made a runescape guide because runescape wasn't working. I think I did very well and it should help lots and lots of you f2p people. Everyone plz check it out and comment on the comments page! Thanx!
-- freewebs.com/dylan1199 --
(I know the comments aren't for advertising, but it's basically just like a walkththrough for a flash game...and it will help most likely so you'll be happy that i posted this!)