Editing the actual HL2 game...

[Funky Munky]

Half-Life 2 Reloaded.

I just finsihed the game and I was wondering could you edit the game itself to include more enemies when the existing enemies spawn. The most you ever see spawning are like 6 or 7. I'd like to some challenge to the existing game.

Is this possible?

 

[The Dark Elf]

you can spawn new npc's around the map, turning AI off first and then place them then go back to where you started and play through it. But other than that no not really, you can't edit the maps much. Certainly not properly in Hammer.

 

[Angry Lawyer]

You could do it in the code. Simply have the game scan on start-up for all pre-placed monsters, and have it place a duplicate a few feet away from it.

-Angry Lawyer