How do you make the levels go reptitive. Like when all lvl 1 units are killed, lvl 2 units come out, etc etc. I've been trying to look at other defense maps, except they use wait trigs or set timer.
Help is appreciated.

Heres one way:
The computer controled player that controls the levels must not have any other units than the ones you have to kill.
COND.
- Player Computer Suffers death of at least 1 '(unit thats in the level)'.
- Player Computer commands 0 units
ACTIONS
- (Triggers to start next level)
Or you could try:
Players
Whatever
Conditions
[Level Switch] Is Set
[Computer] Commands [Exactly] [0] [Units]
Actions
[Clear] [Level Switch]
[Set] [Next Level Switch]
etc.
Liberi you should know that im not fond of using switches cause whenever i tried they never worked.

Td's way uses less trigs so ill take his.
Thx td, it works but i got another problem. I had units posted on one side to show the levels, so uhh what can i do now? I can't have one living or else the next lvl won't start.
Well... I was suggesting an alternative.
If you are going to show the level like that, then I'd suggest you use my trigger or find some other way as TD's will not work properly.
With my trigger, simply change the condition thus:
Conditions
[Level Switch] Is Set
[Computer] Commands [Exactly] [1] [Units]
Okay, you may not like Switches but if you're gonna make maps that get complicated, you should start learning to like them. B)
Heheh. I now have another idea. I'll just make hallucinations, since they don't really count as real units.

Don't do that, they'll die then.
Yes, my way requires the computer to own no units.
Duh, im not stupid, imma put unlimited magic on the hallucinations.

That doesn't work. The Hallutionations don't live on magic, they run on something that isn't specified in the editor.
DAMMMIT, ya i guess your right, guess the newest editor will have that special "magic" as you sed it.

I'm using real units i guess.