Movement Help For TD

[mattman111]

Ok ive been looking around in the tutorials and i cant find help for this. so say if my creeps spawned and went to a waypoint 1 and the maze the player made forced the creeps back thought the spawn region. well the spawn region has a enter trigger on it. so if the creeps enter it again they go back to waypoint 1 and keep going back and forth till they die. Not cool right? Does anyone have a good and effective way to fix this. i thought about making 36 unit groups since there is 36 movement regions. but that seemed too expensive. Any ideas?

 

[onix_noob]

when a unit enter in region 1 change the costum value of this unit to 1, when enter in 2 change it to 2 and when enter in region 1 again and it's costum value is 2 order it to attack to region 2