Alternative content

Tips and Tricks:
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Your FlaK fires with some inaccuracy, use this to your advangtage, find dense points and areas to cover with your fire for maximum damage.
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Every air raid request costs more and more after each call (there is a ceiling of 15.000), use them only if you really need to.
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The longer a balloon survives of the field, the less score you gain by destroying it.
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If a balloon with not much damage comes too close, don't waste your fire on it, look for other baloons which you can still halt from dropping bombs.
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Every building you place becomes stronger over time (oil rigs produce more score, cannons fire faster and/or stronger), so keep them alive as long as you can!
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After leveling up a few times, it's worth replaying easier levels to earn a higher score. The score difference adds to your total score, which can level you up again.
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Try to earn gold medals, they raise your level final score a lot.
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If the game runs slowly, you can decrease the image quality in the options menu.
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There are hidden levels which appear only if you complete some specific levels on the map with the highest rank available.
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You can see military rank markers above the scores for each levels. If you see 5 starts, iteans that you have reached the highest score rank for that level.
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Balloons have different behavior and parameters according to their colors/textures. Many of them are equipped with multiple bombs.
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If a balloon survives floating through your area, it comes in for an other round, reloaded with bombs, having some damage healed and an increased speed.
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Balloons are getting tougher towards the end of the level, so try to keep your defenses alive.