A tweet from the DOOM account announces the playable demo for DOOM is being extended. This was originally only to be available through E3, but now for undisclosed reasons they have decided to extend this for an undisclosed period of time. Word is: "Due to popular demand, we're extending the #DOOM Demo! Download now and #FightLikeHell http://doom.com/demo." They later explain their lack of reasoning on this: "This was initially for E3 week only. But we figured, what the hell."