i'm thinking of a Single player campaign that is essentially a "normal" FPS where you actually shoot things, and some puzzles that would require the portal guns.

Now with my testing, there seem to be 2 problems:
- Portal does not seem to support weapons other than the portal gun. I've put a weapon_pistol on the ground and the player is able to pick it up, but i can not switch to it. Looking at the keyboard shortcuts, there is none. Do I have to make a mod with custom code to enable weapons?- Another thing: I've put a Zombie in a room, but it ignores portals. It does not fall through it, and it does not see me through the portal. Is there anything I can do?
Thanks for any hints!

For the portals, I think i'll plan the game so that the areas where the player has to use portals are not involving enemies directly to work around that.