Click on the grid to add towers. Facts: The towers flash to indicate that they have a target. The ais are invulnerable so that their paths can be blocked. The ais will break out of being enclosed. See if you can play until all 1000 test ais move across the screen. FAQ : Is this for a tower defence game thing? Yes.
I have been playing a variety of tower defence games. I have noticed that it has become completely acceptable that enemy units are incredibly determined to walk through an obviously dangerous place. Also I am unsatisfied with the mechanic of blocking the user from trapping the enemies. I will not stoop to this level.