This is a DLC, the base game is not included in the pack.
Anyone can enter even without having the base game, this is due to a bug. Check that you have the base game: http://store.steampowered.com/app/209080/

If you enter without having the base game (like user with autojoin) you will be blacklisted. Winner will be checked.

The keys are delivered via steam chat. If you have problems activating the keys, contact me first.

If everyone is well, GL & Enjoy! xD