I’ll try and describe roughly.
This tactic works best with a diagonal-ish maze. It also assumes you have 20 lives each, rather than 40.
Part 1) Just build the maze out of debris guns, like normal. Once it’s finished (or you regard it as finished) upgrade 4 debris guns near the centre to their maximum possible upgrade. Then, sell 2 of the unupgraded debris guns right near the beginning of the maze, and replace them with fully upgraded frost towers. Because of the range of the super-debris, they will be fired on by 4 super-powerful guns as soon as they arrive, and will be slowed down by the frost towers as well. This in itself is a good combo, but now part 2 comes into action.
Part 2) Next to one of your frost towers, build a shockwave tower – or alternatively, if you don’t like them, build a missile tower a little further away, where it gets maximum coverage. If you’ve gone with shockwave, concentrate on upgrading it to full – if that means saving up and doing nothing for a few turns, then so be it. If you’re using missiles, just upgrade as quickly as possible. This works because the frost towers cause the enemies to bunch up, thus making splash damage more effective. (Note: A fully upgraded shocker does 2000 damage, as opposed to ~260 for a fully upgraded missile – which is why I prefer the shockers.) This should kill most ground enemies quite quickly – and although you may take a little damage from the flyers, it won’t help your opponent in the end.
Part 3) If you’ve made your maze how I make mine, it should reach the edge of the green box. Upgrade some of the debris guns at the very edge to full, to help a little against flyers. Simples. /squeaks
Part 4) This requires a little explaining. I’ve heard it said many times that it’s after the flying boss that things get interesting. By part 3, you should be long past the flying boss, and both you and your opponent may have taken a little damage. Which means that soon, the level I call “Killer flying” will arrive.
“Killer Flying” is a level of flying enemies which kills everyone I come across (so long as it’s a 20-life game). I don’t know what level it is, exactly, but if you’ve played this game for long enough then you should know about it.
You know when it’s coming, because the flying level that comes before it will almost certainly do some damage to you, (if you have 20 lives at that point you’ll go down to something like 12 or 14) but won’t kill you. Therefore, after that, if you see “flying” written in the “next wave” section, you know it’s the KF.
So, what do you do? Simple. You give your opponent 10 extra enemies. You’re going to die too, but flying enemies makes it almost certain that your enemy will die more, so you win.
Conclusion) This tactic has won me 95% of the games I have played with it. Often, my opponent is losing anyway when I get to the KF< but I like to be sure. Often, my opponent goes down to -26 lives, while I stay up with the lofty number of -13, or something.
Feel free to bombard me with questions. Thank you for reading, even though I don’t know if you read this or not.