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Bethesda and id Software have blown open the gates (of hell) today with the 6.66 update for Doom. Today's update unlocks all multiplayer DLC content for all players. This includes nine maps, three weapons, three demons, new armor, and equipment that may have been locked behind a paywall with the game's Season Pass. This update also totally overhauls the game's progression system.

In the past, gear such as guns, equipment, and customization options were unlocked randomly. Now, the unlocks are set in stone and are tied to specific level requirements and besting specific in-game challenges. If you know of something you really want to have, you can now set a goal in stone on how to earn it instead of just hoping the RNG Gods are on your side today.

Let's let Director Marty Stratton give us some additional details, yeah?
For our veteran players, we know you’ve been unlocking items through both the original random progression system and/or via DLC purchase. We want to ensure everyone has the opportunity to both retain previously unlocked items if they choose, but also unlock anything they don’t have through the new level- and challenge-based progression. To do this we will be resetting all veteran players to level 0. Don’t panic, though – that’s just your level. All veteran players will have the option to completely reset their unlock progression items and experience the new progression system fresh, OR retain all of their existing guns, equipment, demons and customization unlocks that they’ve acquired or purchased and then unlock the remaining items through the revised progression system. Regardless of whether you keep your gear or choose to re-earn it, we’re giving all veteran players a special badge recognizing their previous experience in the game. For those elite few who have achieved the max Slayer level, we’ve designated a special Slayer badge for you.

A New Runes System, Better Player Information, Revised User Interface
On the gameplay front, we’ve replaced the Hack Module System with an all-new Runes System. Much like the Runes system from the DOOM campaign, multiplayer Runes are now persistent player abilities earned and included in a player loadout. Unlike the previous Hack Modules, Runes do not need to be activated and do not expire. Runes are persistent capabilities (or perks) that become a consistent and predictable component of your loadout and play style.

We’ve also overhauled most of the in-game HUD, including better callouts for challenges, awards and scoring. The kill card has been completely revised to provide players a more clear and accurate account of their demise, including not just who killed them but also the players, weapon types and damage that combined to kill them.

Players will also discover numerous improvements throughout the menus and user interface, including completely revised post-match summaries as well as updates that better illustrate player status in lobbies, highlight the new progression options and status, and better outline weapon, equipment and demon characteristics.

Now on top of all of this, there are also free weekends for Doom coming.
Xbox One
Start: 12:00 PM (ET) on July 20
End: ??? (Probably late on Sunday?)

PC
Start: 1:00 PM (ET) on July 20
End: ???

PlayStation 4
Start: 12:00 PM (ET) on July 27
End: ???

There were no end times provided but given that it's a free "weekend" you should probably have a good idea of how much time you'll have. These beta weekends allow you to play the first two levels of the single player campaign, plus a sample of the Arcade Mode, plus unlimited access to the game's competitive multiplayer and SnapMap modes.

If you do decide to buy the game during these weekends, it needs to be said that the price for the game will be just $14.99 (USD) through digital retailers. Even if you buy the game just for a single mode, $15 for Doom is a tremendous deal.