We're planning to try some of the beginner/intermediate war games from OverTheWire.org
Leviathan
This wargame doesn't require any knowledge about programming - just a bit of common sense and some knowledge about basic *nix commands. We had no idea that it'd be this hard to make an interesting wargame that wouldn't require programming abilities from the players. Hopefully we made an interesting challenge for the new ones.
Natas
Natas teaches the basics of serverside web-security.
Krypton
The Krypton wargame features encryption and ciphers.
The games start easily, but get complex quickly - so those that already know their way around will get a challenge too.
This is a great event to get to know everyone, you can work through the levels at your own pace, or just help out others that are stuck. We'll also talk you through the solutions to help beginners learn.
We're being hosted in The Gamer Club, so there is free tea and coffee, or you are welcome to bring in your own beers/wine and snacks.