I'd like to say that you should have an official version of the game, not cracked, or this guide will not work!. With that out of the way, grab your friends, and lets begin!

Now, just follow what I say, and it gets really easy.

THIS IS IMPORTANT. MAKE SURE YOU HAVE YOUR FRIENDS ADDED ON WAW AS WELL. OTHERWISE, THEY CANNOT CONNECT.

1. USE HAMACHI.
2. have your friends make accounts, and join the party
3. start up your game, and set up a LAN lobby with your zombie map, or campaign level of your choice. (make sure you set your server name as something distinctive)
4. then, have your friends go to find game
5. switch the top setting that says "Internet" to LAN, and they should be able to find your lobby.

It's pretty simple! I can say that it worked for me and my friends so, it should/could do the same for you! Have fun.

Secondly, simply just port forward. It's a short process, where you need to find your ip, and port forward the WaW process, and you should be able to just invite them directly through WaW!

I've also heard apparently that you can avoid all of this and just straight up invite friends. Trial and error works well.

Since you decided to come here in the first place, i'd like to reccomend some maps to play with pals, and I will be arranging them in terms of quality and obviously fun!

First off, check out websites like UGX Mods, and ZombieModding!

Now, if you have UGX Map Manager..

Start yourself off with the ballbags maps. Trust me. I don't know why they're there either, but they are. Also, check out ZombieModding's LSD.

For more serious maps, check out Rainy Death, Oil Rig, UGX Reqiuem, and for this time of year, check out Snowy Ornament! I might add more over time, but those are just tips! Have fun, and keep playing!