Lost in Nightmares is a story-based DLC for Resident Evil 5, set during a previous mission hinted at in a flashback from that game. It is about 1 hour in length, depending on the difficulty and experienced players can beat it in under 30 minutes. It is, all together, one chapter filled with classic puzzles and moments calling back to the first Resident Evil. This add-on in its initial release cost 400 Microsoft Points for download on Xbox LIVE or $4.99/£3.99/€4.99 on the PlayStation Network. It was also included in Resident Evil 5 Gold Edition on the Xbox 360 and PlayStation 3, and remastered re-release on the Xbox One and PlayStation 4 along with all of the other extra DLC.
- Main article: Raid on the Spencer Estate
The BSAA receive a tip-off on the whereabouts of Umbrella's founder, Oswell E. Spencer. Chris Redfield and Jill Valentine are assigned to raid his estate and arrest the elderly man in the hopes he will have information on where to find Albert Wesker.
After breaking into the estate, Chris and Jill see that the entirety of Spencer's security is dead and are forced to relive old memories as they make their way through traps and puzzles that are harrowingly similar to those of the Spencer Mansion.
Combating multiple Blobs that roam the estate, they finally reach Spencer's office, but are instead confronted by the sight of Spencer's corpse and none other than Albert Wesker standing over his body. Chris and Jill waste no time in trying to apprehend Wesker, but their efforts are of little success due to Wesker's superhuman speed and strength and they are easily overpowered. Wesker finally prepares to deliver a blow that would end Chris' life. Seeing what is about to happen, Jill without hesitation makes the ultimate sacrifice to save Chris' life by selflessly lunging at Wesker and sending them both through a window and over the side of a cliff. Chris can do nothing but watch helplessly as his partner falls to her apparent death.
This extra chapter is not accessible from the start of the game. It becomes unlocked after Chapter 3-1 has been completed in the campaign.
The scenario can be played in single player or in local or online co-op. It also features a scoreboard with worldwide rankings based on performance in the scenario as well as collection items.
Chris and Jill can be selected to play as, and the four difficulty settings from campaign -Easy, Normal, Veteran, Professional - are also selectable settings, with Professional unlocked after beating Veteran. Difficulty effects how much damage is taken, how many Blob monsters can spawn in the Spencer Estate and are required to continue pass the basement, the movement speed of Blobs. Professional will rearrange the key items in the basement and remove Blob icons from the mini map.
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- If one looks closely at a score star, the words 'The African Star' can be read. This is strange as Chris and Jill are in Europe. It could be that African Stars were originally going to feature in the main game before being replaced by the BSAA emblems.
- After getting the Heat-sensitive paper you can hear metal material falling to the floor. When searching the room there is no evidence of what made the sound. In Veteran and Professional modes a Blob can be found in this area after completing the spike ceiling trap room. The sound could be a reference to it, as it resembles the sound of his weapon hitting the ground.
- If the player returns to the Dining Room right after the Centaur emblem has already been retrieved and used on the door to the hallway, piano music can be heard coming up from the piano room. However, if the player goes up to investigate, the room will still remain empty.
- There is a similar occurrence in Resident Evil 6 during the first chapter of Leon's Campaign where the same piano can be heard through the door where Liz is located. Inside the room there is in fact a piano, but the sheet music is soaked in blood and the keys appear to be untouched.
- The teaser trailer for the episode shown some cutscenes that were not in the game. For example, During the fight with Wesker, Chris asks Jill "Are you OK?", then they go back-to-back and she replies "I'm fine". Another removed scene shows Jill falling from a balcony, but Chris catches her hand at the last second. Interestingly, a similar scene of Jill falling was used again in the trailer for Resident Evil: Revelations.
- There is some unused dialogue with Chris and Jill talking about Chris flirting with a younger co-worker. As with most cut audio, it remains within the game files.Jill's L.I.N voice files. Jill's unused voice files can also be heard here.
- It is possible to get the Centaur emblem at the Piano Room without needing Jill to play Moonlight Sonata. By throwing a hand grenade at the right angle, it'll go through the wall and hit the red button right next to the emblem, instantly lowering the door.
- If one checks the main hall front door three times (when the text says "?") the camera system reverts to the static camera angles and tank-control system used in the original Resident Evil. When the player dies, goes to the next area, or checks the door again three more times it will go back to the normal camera angle.
- When playing as Jill and the player dodges Wesker's attack where he punches then stomps, the prompt will read "Flip Kick", but Jill will perform the "Cartwheel Kick" instead.
- Throughout Lost in Nightmares, there are many references to earlier titles in the series.
- The estate itself is a near replica of the Spencer Mansion.
- Going through doors in the Mansion area will cause the camera angle to go to a first person perspective, mimicking the load screen of early titles.
- The piano scene in Lost in Nightmares can be seen as a parallel too that in the Spencer Mansion where the Moonlight Sonata must be played to obtain the Gold Emblem from a room behind a wall. A similar situation happens in Lost in Nightmares where Jill plays the piano revealing a hidden room where Chris must obtain the Centaur Emblem.
- An abbreviated version of the Keeper's Diary from the original Resident Evil can be found in the upstairs bedroom. It features slightly different wording and less entries. Reading it yields one of the passcodes, stuck between the last few pages.
- A spiked ceiling comes down on Jill while Chris has to save her or vice versa, deliberately recalling a specific event from Resident Evil, where the ceiling drops on Jill and Barry saves her.
- When walking through the hallway with three windows on the right (from the main entrance), a bat will break through the last window and a second later a dog can be heard howling. This is in reference to a similar hallway in the original game, where a Cerberus would burst through that window.
- If one is to look at the pictures in the hallway before the spike ceiling trap, you will be able to see pictures of the undergrounds and ancient ruins encountered in the main story. You will also see what appears to be a man standing in some of the pictures. This is presumed to be Spencer at the time of rediscovering the Stairway of the Sun flowers.