Wiki/wiki-rtd/docs/wiki_engine_guides/gzdoom/gzdoom-guide.md

# Guide: GZDoom

<img src="../../../wiki_images/logos/gzdoom-logo.png" width="150">

GZDoom is the open source game engine for ID Software's older games like DOOM, DOOM2, HEXEN and HERETIC or it's own unique games.

### GZDoom Links:

[ZDoom Web Page](https://zdoom.org/index)

[GZDoom Github](https://github.com/ZDoom/gzdoom)

[ZDoom Forums](https://forum.zdoom.org/)

### Freedoom

The Freedoom project aims to provide all the content needed to form a complete, entirely free/libre game for the Doom engine. It is designed to be compatible with most custom levels, music, graphics and other modifications (“mods”) made for the original Doom games by Doom fans and artists over the decades.

[FreeDOOM](https://freedoom.github.io/)

### Where to buy official DOOM?

We recommend that you at buy both `DOOM 1993` and `DOOM 2`.

`DOOM 3` and `DOOM 64` are not needed but we list them here because it is sometimes cheaper to buy the whole bundle.

**GOG Links:**

- [DOOM 1993 - GOG](https://www.gog.com/en/game/doom_1993)
- [DOOM 2 - GOG](https://www.gog.com/en/game/doom_ii)
- [DOOM 64 - GOG](https://www.gog.com/en/game/doom_64)
- [DOOM 3 - GOG](https://www.gog.com/en/game/doom_3)

**Steam Links:**

- [DOOM Classic Bundle - Steam](https://store.steampowered.com/bundle/27490/DOOM_Classic_Bundle/)
- [DOOM 1993 - Steam](https://store.steampowered.com/app/2280/DOOM_1993/)
- [DOOM 2 - Steam](https://store.steampowered.com/app/2300/DOOM_II/)
- [DOOM 64 - Steam](https://store.steampowered.com/app/1148590/DOOM_64/)
- [DOOM 3 - Steam](https://store.steampowered.com/app/208200/DOOM_3/)


## Where to put the games
GZDoom games should be put under the `retrodeck/roms/doom/` directory.

### File types
- .wad - `Where's All the Data?` file
- .iwad - `internal wad`
- .pwad - `patch wad` have priority over iwad
- .pk3 - is a `.zip` file archive
- .ipk3 - `internal pk3` file
- .pk4 - is a `.zip` file archive
- .pk7 - is a `.7zip` file archive
- .pke - is a `.zip` file archive made for the the Eternity Engine
- .epk - is a `.zip` file archive made for the EDGE engine
- .deh — `DeHackEd file`, edits hardcoded parts of the DOOM engine.
- .bex — `Enhanced DeHackEd` file has more features then `.deh` and used by various ports.
- .lev — A file that renames levels of a `.pwad`
- .mus — `Music file` format of `DOOM`, `Heretic`, `Hexen` and `Strife`


### Does GZDoom require BIOS or Firmware?
No

## I have bought the games how do I get my files?

Read the:

[How to: Extract Doom iWads](extract-doom-wads.md)

## I only want to play standard doom and have no interest in modding or customization
Do as said above put the .WAD files directly into `retrodeck/roms/doom/` and they will run as normal, enjoy.

## I want to play doom with mods

Read the:

[RetroDECK .doom file for modding](retrodeck-doomfile.md)