# 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/)

### Where to buy 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)