Canyon Defense

Canyon Defense
Hints:
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Submitted by: David K.
* In first levels place some towers near the entry point and at
  least one tower about a third of the way on the map to kill
  enemy who evade the early towers.
* Flying enemy aircraft appear about the 7th attack wave, so make
  sure you place and anti air gun around the middle of map.
* To place anti air gun click advanced tab and select the AA Gun
  which costs $150.
* After that it’s just a matter of personal strategy, placing
  defense towers where you think they are best able to protect
  your city from each wave of attack.
Next attack:
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To bring next wave of enemies onto map early, click the play button.
Cheat:
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Submitted by: matt strausberger
If you have enough money to buy a wall factory buy it and the wall part will show up
if you want more walls to put instead of waiting for it to load put the wall where
you want then sell the wall factory an buy it again an put it back in the same spot
the wall thing will show up loaded so if you do it over and over again you can put as
many walls as it lets you.