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Starting money +100 for $1000 is an incredibly OP upgrade, and the solution to every level is tesla tower spam. Gameplay wise, this is brain dead. I'm actually really impressed that it doesn't lag, though! Lots of TDs with simpler graphics lag way too much.
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immediately invest all your money into additional startup money. keep donating to your startup funds until you can fully upgrade a sniper tower before round one. one fully upgraded tower will cover most of the map and will take you through almost all waves in the first matches. after your first, build a second sniper tower and fully upgrade it. placed right, two towers will get you through most levels by themselves. continue donating to your startup fund, and only use the towers you need in each match, pretty much adding only one sniper tower every three or four levels. the more money you have at the end of a match, the more money you get as a reward. since you can add to your startup fund an unlimited amount of times, this adds to your end money, and thus your reward money (as long as you don't spam towers) this adds up quickly, and after repeating a mid level a few times, you will be making 20k each level and can easily buy anything in the store very quickly
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did complete game in one, no save on re .. :D 0/5 stars ( played it several times before years ago allready now, never had save probs before ... )
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Also, as a side note: the lightning & sniper towers are far to strong. In my opinion the lightning tower is far too good. Two of these, fully upgraded cost close to the amount of a sniper tower and do far more in damage with a similar combined range. Heck, six to seven lightning towers can win every level with a single choke point w/o any help.
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There were a few bugs that have all ready been listed in the best section, but a part from that it was a decent game.
One suggestion would be to limit the number of Start Fund Bonuses that you can purchase; having a 60K starting fund 40 minutes in is a bit unbalanced and makes the game far too easy when you can blanket the map in cheap fully upgraded towers.
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Way too easy and not balanced. All you need is the Sniper Tower. It does fully upgraded the same damage as the Rocket Tower fully upgraded, but has a higher range and a higher rate of fire. Plus, it doesnt shot on vehicles only.