STRAIN

STRAIN (STRAIN.WAD and STRAIN.DEH) is a 32-level partial conversion for Doom II released in 1997 by the Alpha Dog Alliance. It features nine new or modified monsters through the use of DeHackEd, modified weapons, and a soundtrack written by David "Tolwyn" Shaw, Mark Klem, and Jon Landis. The project had a sporadic development history, exceeding a year due to cyclical interest and disinterest.

Release formats
The WAD was originally released as a self-extracting file split into four segments, each meant to fit in the 1.44 megabyte storage of a, alongside a  named unpack.bat. This can only be run in or. Using it creates a DOS program named strain.exe which must be run to unpack the WAD. Because it requires DOS, strain.exe cannot be run in 64-bit versions of Windows, requiring the use of. However, the batch file must not be run in DOSBox, as the emulator does not interpret the file-combining feature of the DOS and Windows "copy /b" command correctly. This package is available on the idgames archive in strain10.zip.

On June 24, 2015, Eric Baker created and uploaded a separate "repackaged edition" of STRAIN to the idgames archive that consists simply of the contents of the LHA, including the required WAD file and DeHackEd patch, with the original strain10.zip bundled with it for copyright reasons. This package was made due to the difficulty of unpacking the original release for users without either DOS, Windows, or the knowledge of DOS and Windows necessary to do so. When the files are extracted from this version, the WAD and DeHackEd patch can be loaded directly into a source port without any further user interaction. It is available on the archive as strain.zip. A similar repackaging was also created by Andy Olivera for the Doomed Speed Demos Archive in 2008, but without the original release bundled with it, and is the version provided for download on its demo page.

Doom Wad Station provides a version fixed for certain source ports at their STRAIN Page (see Other notes for details).

Both the original and unpacked-for-convenience initial + sourceport-fixed releases are available at STRAIN ModDB page.

Story
STRAIN occurs after the events of Doom II. A military officer in a secret base on the Earth's moon has been engineering demons, creating a new breed of Hellspawn which breaks free of its confines, making an initial landing on Earth. The Doom marine undergoes an experimental treatment to increase his combat potential. Its side effect is that it leaves virtually all of its subjects in a state of perpetual, murderous aggression. The in-game story follows four episodes as the marine fights to an infested spaceship that has landed on Earth, afterward battling his way deep into the heart of the secret installation where the demons originated from.

Levels

 * by Bill McClendon
 * by Bjorn Hermans
 * by Florian Helmberger
 * by Adam Windsor
 * by Jon Landis
 * by Jon Landis
 * by Adelusion
 * by Rich Johnston
 * by Adelusion
 * by Charlie Patterson
 * by Bill McClendon


 * by Bill McClendon
 * by David Rotramel
 * by David Graves, Adelusion, Rich Johnston, and Arthur Chang
 * by Chainsaw
 * by Charlie Patterson and Eric Roberts
 * by Holger Nathrath and Arthur Chang
 * by David Rotramel
 * by Darrell Esau
 * by David Davidson


 * by Adelusion and Arthur Chang
 * by Adelusion
 * by Adelusion
 * by Adelusion
 * by Arthur Chang
 * by Holger Nathrath, Charlie Patterson, and Eric Roberts
 * by Andy Badorek
 * by Bjorn Hermans
 * by Ron Allen
 * by Jon Landis and Rich Johnston


 * by Jon Landis
 * by Holger Nathrath and Adelusion

Soundtrack

 * MAP01: "TechnoDoom" by Mark Klem
 * MAP02: "The Hell 'Prince' Medley" by David Shaw
 * MAP03: "Inner Turmoil" by David Shaw
 * MAP04: unknown track by Jon Landis
 * MAP05: "State of Mind" by Mark Klem
 * MAP06: "Simple Solutions" by Mark Klem
 * MAP07: "Suphilixious" by David Shaw
 * MAP08: "Danger" by Mark Klem
 * MAP09: "Beneath" by Mark Klem
 * MAP10: "Thin Ice" by David Shaw
 * MAP11: "Treasures in the Dark" by Mark Klem


 * MAP12: "Scent of Hell" by David Shaw
 * MAP13: "Land of Able" by Mark Klem
 * MAP14: unknown track by Jon Landis
 * MAP15: "Danger" by Mark Klem
 * MAP16: "Novaroid" by Mark Klem
 * MAP17: unknown track by Jon Landis
 * MAP18: "Simple Solutions" by Mark Klem
 * MAP19: unknown track by Jon Landis
 * MAP20: "Phenomenon" by Mark Klem


 * MAP21: "Continue On" by David Shaw
 * MAP22: "Thin Ice" by David Shaw
 * MAP23: "Treasures in the Dark" by Mark Klem
 * MAP24: "TechnoDoom" by Mark Klem
 * MAP25: "Beneath" by Mark Klem
 * MAP26: "In the Heart of Darkness" by David Shaw
 * MAP27: unknown track by Jon Landis
 * MAP28: unknown track by Jon Landis
 * MAP29: "State of Mind" by Mark Klem
 * MAP30: unknown track by Jon Landis (same as MAP04)


 * MAP31: "Scent of Hell" by David Shaw
 * MAP32: "" by


 * Title screen: "Vertigo" by David Shaw
 * Intermission: "Adrenaline Rush" by David Shaw
 * Text screen: unknown track by Jon Landis

This is a arrangement of music composed by Robert Prince.

Arranged by Jon Landis.

Weapons
STRAIN modifies the original Doom weapons as follows. STRAIN makes several other core gameplay changes.
 * The marine punches quickly with both fists in succession. Both swings are boosted by the berserk powerup.
 * Pistol fires faster.
 * Shotgun has new graphics, fires faster and is now called Sawed-off.
 * NFG replaces the plasma gun. Its behaviour is similar to the weapon it replaces, but the base damage of its projectiles is seven points higher (meaning the damage dealt by each projectile ranges from 12-96 as opposed to 5-40) and its cooldown period is increased.
 * Psychic Blaster replaces the BFG9000. It consumes three rockets per shot and behaves similarly to the rocket launcher. It fires faster than the rocket launcher and its partially invisible projectiles are more powerful (damage ranges from 200-1600 plus blast damage), but in exchange they're slower. It also has a slight delay upon firing the first shot.


 * Players begin with no ammo at pistol start.
 * Cells are capped at 50 (100 with the backpack). In addition, energy cells and energy cell packs are now called mini-battery and battery respectively. The number of cells provided by the ammo pickups is also reduced, with the mini-battery and battery giving the player 3 and 15 cells each.
 * Megaarmor sprite is replaced and increases armor to 300 percent.

Monsters
STRAIN features a number of new monsters. The most basic monsters (zombieman, shotgun guy and imp) are unchanged, as is the arch-vile, the cacodemon, the Hell knight and the baron of Hell. The heavy weapon dudes have new sprites and are now called Subverted Guard but are otherwise unchanged.


 * Class 2 imps replace arachnotrons. They appear identical to an imp with a higher-pitched alert noise. They move incredibly fast. Attacks begin with a brief pause, after which they stand still and throw fireballs at a steady pace. They're able to infight with regular imps.
 * Skinless demons replace demons and are recolored to bright red. They are significantly more durable than regular ones.
 * Holobots, replacing pain elementals, are wheel-shaped, flying one-eyed robots. They fly very slowly and fire both types of revenant missiles, which travel at a much slower pace.
 * Invisible holobots, replacing revenants, behave like regular holobots but are partially invisible like the name implies. They're able to infight with regular holobots.
 * Dopplegangers replace lost souls. They're similar to lost souls in appearance, but their eyes and the top part of their flame is blue. They attack with an imp fireball before charging and are also able to use the imp melee attack. They also count towards the kill count.
 * Ministers of Hate replace cyberdemons and are miniature versions of it with much less health. They fire normal rockets (only one at a time, as opposed to a regular cyberdemon's three-rocket salvo) and retain the blast damage immunity.
 * Polydrones, replacing spiderdemons, are flying cubes that resemble spawn cubes. They attack with the spiderdemon's chain shotgun. Their corpses are fiery wrecks that damage the player at close proximity.
 * Demon lords, replacing mancubi, are similar to barons and hell knights, but colored white. They are the most durable monsters in STRAIN. They attack in several barrages of five green plasma attacks spread in a wide arc. Their attack animation is broken, making them fire much sooner than expected.
 * BFG troopers replace spectres and behave just like zombiemen. They attack with BFG blasts.
 * The decompression daemon is an unused monster that replaces the SS trooper. It is invisible, incredibly small and fast, and can instantly kill the player, even in god mode. The STRAIN team made it to simulate death due to exposure to the vacuum of space in certain sections of the story's moonbase but did not implement it in the final product.

Other notes

 * is impossible to complete in ports based on old versions (prior to 2.3.0) of ZDoom, as the level relies on the occurrence of a spechits overflow in order for the exit to work. Recent versions of ZDoom identify the map and automatically apply the required compatibility flag. There are also problems with the DeHackEd patch when it is used with Doom Legacy. Doom Wad Station provides a fixed version at their STRAIN Page. The fixes are mentioned to have been done by Zorcher @ Doom Connector, as the description says, the DEH having been packed into StrainJive.wad. StrainFix.zip including both the fixed and the original WAD versions was compiled and submitted to the web by WinstonSmith6079.


 * MAP09 originally appeared as MAP04 of Dystopia 3.
 * MAP23 originally appeared as MAP10 of Dystopia 3.


 * Holger Nathrath's levels were likely donated outtakes from the cancelled Serenity IV project, according to Sam Woodman's notes in . Nathrath attempted to donate such maps to the Eternity TC and Sam Woodman's megawad, Testament of Judgement.


 * There are a few examples of continuity. MAP18 begins in the same hall as MAP17 did. The door that was locked in the previous map can now be entered, and the opposite door that was entered previously is now locked. In MAP22, the player visits the corridor that overlooks the hall. Finally, in MAP24, there is an accessible teleporter in the center of the hall, and the player needs to use it in order to progress.

Demos

 * , recorded by Jason Henry, Michael Grube (migru), Kai-Uwe Humpert, Peo Sjöblom and Yonatan Donner

Miscellaneous

 * Official STRAIN Website
 * Doom WAD Station STRAIN Page containing the version fixed for sourceports
 * STRAIN page at ModDB
 * at Doomworld forums