Addicted
I've taken my time.
First, I got all my achievements with minimal upgrades. I was at level 17 for most upgrades when I completed the 57 achievements. I had $75 million in the bank.
Then I spent all my upgrade funds and just defeated one difficulty level at a time, and got up to level 360. I would have a perfect game about 25% of the time, but usually lost 3-8 lives--mostly because I wasn't paying attention or was in fast mode.
Then I decided to see how far I could go, keep my main upgrades at 42 and starting health at 65. This time after winning, I moved up 10 levels each time. At level 360 I was earning $15-$17 million each game.
Game play slowly became more difficult. By level 500 I was losing 10-20 lives, but earning over $20 million/game. But would win any game that I paid good attention to game play.
Then things got tough. I started losing games. It required far more attention. It took me about 5 tries to win at Level 540, but earned $24 million when I did win.
I had to modify my strategy. Normally, I built ground and air defenses concurrently. I found it more effective to just build ground defenses, and build no anti-air until about game level 40, or so. I used a couple Teleport defenses for both aircraft and ground, and by level 40 probably 20 aircraft get through. Then I spend 90% of my funds on anti-air for the next 30-40 levels. When I built concurrently, too many ground and air attacks overwhelm me. Even though I send them back to the start, it gets expensive paying $3 to reset the defense for each one.
I haven't played at level 550 yet, and I'm not sure when I'll spend my upgrade funds. I'll probably give level 550 a couple tries.
I've currently banked $440 million.
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