Create a trigger that whenever a unit enters your region outside the gate, you check if he has your key. And if he has it, remove your item from the backpack and open the gate.
Why don't you show us your triggers so we can see if there are any errors? People here are not mind readers you know, and if we were I doubt it would work over the internetz. :D
I'm not trying to be mean or something, but angel arena has to be the worst and most imbalanced game ever. All you do is kill monsters that come out of some gates with .01 attack speed and have one-hitting abilities. Awful.
I'd suggest you to try out:
Gem TD. Fun and unique TD, really well...
Agreed. Turn of the waves and make it green, would probably look better. And those trees do not look very "swampy". Maybe use the northrend trees and tint them slightly green? Just an idea. And use some shrub and river rushes?
I will probably make a footmen-styled map or some kind of map with tons and tons of units. Controlling more then 12 units at the time ftw. You will probably be able to do some really advanced heroes now aswell when you can have as many stats as you wish.
Everyone here seems to want to create...
Footmen maps are so utterly imbalanced beyond any kind of help. Just the fact that I must have atleast 20 footmen maps of version 5.4 proves it. The heroes are unoriginal, most of them are just normal wc3 heroes, and those who are custom are those who are most imbalanced of all, but often it's...
But if you do that and still have every trigger run every 25 sec, it will be exactly the same as before, they will all run once the first 25 sec of the game. You have to increase the time of each trigger with 25 sec or make them all in one that runs every 25 sec.