Compatible IWAD

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For more information on this article, visit the Compatible IWAD page on the Doom Wiki.

An IWAD - short for Internal WAD - is the main resource file for a Doom-engine game, containing all the game's original sounds, levels, and graphics. ZDoom needs an IWAD file in order to play; without one the ZDoom engine has no game data to use.

Supported IWADs

Notes:

  • Some file names are links to a page on the DoomWikiLogoIcon.pngDoom Wiki where you will find checksums for known versions of the concerned file.
  • Some files have conflicting names; ZDoom provides you with possible aliases. Note that an IWAD is actually identified by its content rather than its name. Also, any archive format supported by ZDoom can technically be an IWAD.

Commercial games

Game Name File name File aliases Notes and download links
MiniDoomLogoIcon.png Doom (Registered) DoomWikiLogoIcon.pngdoom.wad Commercial game: MiniGOGLogoIcon.png buy on GOG.com; MiniSteamLogoIcon.png buy on Steam
The Ultimate Doom DoomWikiLogoIcon.pngdoom.wad doomu.wad
Doom "BFG Edition" DoomWikiLogoIcon.pngdoom.wad bfgdoom.wad, doombfg.wad Commercial game included with DoomWikiLogoIcon.pngDoom 3: BFG Edition (MiniSteamLogoIcon.png buy on Steam)
MiniDoom2LogoIcon.png Doom II DoomWikiLogoIcon.pngdoom2.wad Commercial game: MiniGOGLogoIcon.png buy on GOG.com; MiniSteamLogoIcon.png buy on Steam
Doom II "BFG Edition" DoomWikiLogoIcon.pngdoom2.wad bfgdoom2.wad, doom2bfg.wad Commercial game included with DoomWikiLogoIcon.pngDoom 3: BFG Edition, also loads DoomWikiLogoIcon.pngnerve.wad (MiniSteamLogoIcon.png buy on Steam)
Final Doom — TNT: Evilution DoomWikiLogoIcon.pngtnt.wad Commercial game: MiniGOGLogoIcon.png buy on GOG.com; MiniSteamLogoIcon.png buy on Steam
Final Doom — The Plutonia Experiment DoomWikiLogoIcon.pngplutonia.wad
French Doom II doom2f.wad Commercial game, available  at Doomworld/idgames
MiniHereticLogoIcon.png Heretic (Registered or Commercial) DoomWikiLogoIcon.pngheretic.wad hereticsr.wad Commercial game: MiniSteamLogoIcon.png buy on Steam
File:MiniHexenLogoIcon.png Hexen (Full) DoomWikiLogoIcon.pnghexen.wad Commercial game: MiniSteamLogoIcon.png buy on Steam
Hexen: Deathkings of the Dark Citadel DoomWikiLogoIcon.pnghexdd.wad Commercial game: MiniSteamLogoIcon.png buy on Steam
File:MiniStrifeLogoIcon.png Strife (Full) DoomWikiLogoIcon.pngstrife1.wad strife.wad Commercial game, also loads DoomWikiLogoIcon.pngvoices.wad: MiniGOGLogoIcon.png buy on GOG.com; MiniSteamLogoIcon.png buy on Steam
Strife: Veteran Edition sve.wad Commercial game, also loads DoomWikiLogoIcon.pngvoices.wad: MiniGOGLogoIcon.png buy on GOG.com; MiniSteamLogoIcon.png buy on Steam
MiniChexLogoIcon.png Chex Quest DoomWikiLogoIcon.pngchex.wad Commercial game no longer sold

Free-to-play games

Game Name File name File aliases Notes and download links
MiniDoomLogoIcon.png Doom (Shareware) DoomWikiLogoIcon.pngdoom1.wad Free download: Doom shareware at Doomworld/idgames
MiniHereticLogoIcon.png Heretic (Shareware) DoomWikiLogoIcon.pngheretic1.wad Free download: Heretic shareware at Doomworld/idgames
File:MiniHexenLogoIcon.png Hexen (Demo) DoomWikiLogoIcon.pnghexen.wad hexdemo.wad, hexendemo.wad Free download: Hexen demo at Doomworld/idgames
File:MiniStrifeLogoIcon.png Strife (Teaser) DoomWikiLogoIcon.pngstrife0.wad Free download: Strife teaser at Doomworld/idgames
??? Freedoom: Phase 1 freedoom1.wad freedoomu.wad Free download: official site
Freedoom: Phase 2 freedoom2.wad freedoom.wad Free download: official site
FreeDM freedm.wad Free download: official site
 ??? Blasphemer heretic.wad blasphem.wad, blasphemer.wad Free download: official site
File:MiniChex3LogoIcon.png Chex Quest 3 DoomWikiLogoIcon.pngchex3.wad Free download: official site
File:MiniAction2LogoIcon.png Action Doom 2: Urban Brawl DoomWikiLogoIcon.pngaction2.wad Free download: official site
File:MiniHarmonyLogoIcon.png Harmony v1.1 DoomWikiLogoIcon.pngharm1.wad Free download: official site
File:MiniHacxLogoIcon.png Hacx v1.2 DoomWikiLogoIcon.pnghacx.wad Free download: official site
Hacx v2.0 hacx.wad hacx2.wad Free download: WIP download thread
File:MiniSquareLogoIcon.png The Adventures of Square square1.pk3 Free download: official site
 ??? Delaweare delaweare.wad Free download: official site

ZDoom will detect any of those present in its search path and let you choose at startup which game to play (if it doesn't, see the FAQ). In addition to them, some "total conversion"-type mods, such as Wolfenstein 3D TC, can be played as their own IWAD; however since they are not detected as such by ZDoom, you need to use the -iwad command line parameter.

In order to play a custom level designed for any of the above games you have to have that particular game's full IWAD (loading PWAD with shareware, demo or teaser versions is disabled). If you do not have the necessary IWAD, or if you have an old, unpatched version of the IWAD in question, you will get an error message on startup. (But often old versions are accepted too.)

The IWAD file(s) should be placed in a directory where ZDoom will find them. This includes the same directory as the ZDoom executable, as well as those pointed to by the DOOMWADDIR environment variable. You may also configure other directories for ZDoom to search in the zdoom.ini file. On Linux, the directories $HOME/.zdoom and /usr/local/share are checked by default. Finally, if you have bought a supported game from GOG.com or Steam, ZDoom is able to find the IWADs directly in their installation folder and you do not need to move or copy them to ZDoom's folder.

Obtaining IWADs

As noted aboved, some IWADs can be downloaded freely; however most "full" games are not and must be bought from one of the following sources:

GOG.com
This store offers downloadable versions of Ultimate Doom, Doom II: Hell on Earth (bundled with Final Doom and the Master Levels for Doom II), and Strife. The Final Doom version offered is the later Anthology version, which fixes many mapping errors (such as the infamous missing key in TNT MAP31).
Steam
This store offers downloadable versions of Ultimate Doom, Doom II: Hell on Earth, Final Doom, Heretic: Shadow of the Serpent Riders, Hexen: Beyond Heretic, Hexen: Deathkings of the Dark Citadel, and Strife; as well as the Master Levels for Doom II which is a set of PWAD, not an IWAD.
Warning: following the release of DoomWikiLogoIcon.pngDoom 3: BFG Edition, the Master Levels are no longer available to purchase individually but can be bought as part of the Doom Classic Complete Pack.
Note: The version of Hexen: Death Kings available on Steam is not patched. You need to download and apply the Death Kings 1.1 patch first. (The "readme.txt" file it tries to patch has been renamed readme-dk.txt by Steam, but is not important.) All other IWADs from Steam are fully patched.
Amazon.com, eBay.com, etc.
Second-hand copies of the original games can be found on such sites.
Flea markets, used-games bins in brick-and-mortar stores, etc.
It's mostly a matter of luck, but they can still sometimes be found this way.

See also


Important Information

Heretic has issues as support is not finished yet, but the game recognizes this as a valid IWAD nonetheless.

As of this writing, FREEDOOM has entered a Phase 1/Phase 2 branch, which means the IWADs will need to be renamed to doom.wad/doom2.wad, until a new version of 3DGE comes out that will patch this issue.

You can also launch a DOOM 1 or DOOM II PWAD with any IWAD that 3DGE can find at the time, but textures might not display properly, as well as certain sounds/enemies/etc. However, since DDF contains all of the entries for all commercial IWADS, you might get a question mark in place (of say, the Chaingunner) if you are doing this method. This does not apply to IWADS. For example, if you are running a PWAD with MAP01 with the DOOM IWAD loaded, 3DGE will display HELL ON EARTH as an additional episode - though textures will be missing (see below).

If you launch 3DGE with DOOM.wad (the executable will assume DOOM 2 takes precedence) with doom2.wad in the same directory, then you can play both DOOM and DOOM II together (Doom 2's episode appears as HELL ON EARTH), and even use (for example) the DOOM 2 Super Shotgun in the first game. You can also freely warp between MAP/EXMX slots - this also works with TNT and PLUTONIA if they are loaded with Doom 1. PWADS that are for DOOM 2, for example, will load with the DOOM 1 IWAD, but certain textures/patches/monsters will not be present that are a part of DOOM 2 (unless the two IWADS are loaded together).