I'm making a map that I feel would benefit from a feature where if a zombie wanders into a certain area of the map, it would trigger a game over. Could somebody help me out with this?

Use that func, then figure out how to get all the zombies using something like:

You can have a trigger that does 100 damage to all the players. I was about to say, I dunno how to trigger game over. But if all the players are dead it triggers game over anyway.

Here's code from my Gladiator Arena map that slowly kills any players who are touching a trigger_multiple.
You should be able to edit it to do what you want. I don't know how to listen for zombies touching the trigger instead of players but it should be possible. Maybe you can use the KVP from the spawner struct to get zombies.

function damagebox() {
	trigger = GetEnt("damagebox", "targetname");
	trigger SetHintString("");
	trigger SetCursorHint("HINT_NOICON");
	while(1) {
		wait(2);
		players = getplayers(); 
		for( i=0;i<players.size;i++ )
		{
			if(players[i] isTouching(trigger))
			{
				players[i] DoDamage(15,players[i].origin);
			}
		}
	}
}

Please don't create more than one topic with the same question/information. You'll surely get answer with only one topic.
I'll merge the topics.

Lukkie1998

This is quite simple, create a trigger_multiple and add "end_game" as shown: (MAKE SURE AI_AXIS and NOTPLAYER are CHECKED AS WELL)

This is quite simple, create a trigger_multiple and add "end_game" as shown: (MAKE SURE AI_AXIS and NOTPLAYER are CHECKED AS WELL)

(Image removed from quote.)

Thanks for this, you made my week.