To enable cheats in the original 1993 version of Doom, you simply need to type the relevant cheat code while playing the game. There's no need to bring up a console or a chat window; you input the codes directly during gameplay. Here are some of the most commonly used cheat codes for Doom: - **IDDQD**: Grants "God mode," making you invincible. - **IDKFA**: Gives you all the keys, weapons, and full ammo, as well as 200% armor. - **IDFA**: Similar to IDKFA but doesn't give you the keys. - **IDSPISPOPD** or **IDCLIP**: Allows you to walk through walls (no clipping mode). Use IDCLIP if you're playing Doom II or Final Doom, as the older IDSPISPOPD doesn't work in those versions. - **IDBEHOLD**: Followed by a letter, this gives you a certain power-up: - **I**: Partial Invisibility - **V**: Invulnerability - **S**: Berserk - **R**: Radiation Suit - **A**: Area Map - **L**: Light Amplification Visor - **IDCHOPPERS**: Gives you the chainsaw. - **IDCLEV[episode number][map number]**: Warps you to a specific level. For example, "IDCLEV02" would take you to level 2. As a note of caution, using cheats can alter your gaming experience by reducing the challenge. Additionally, some versions of the game might disable features like achievements or progress saving when cheats are active. To disable any active cheats (except level warp codes), you'll generally need to restart the game or load a saved game where cheats weren't used. These cheat codes have become an iconic part of the Doom legacy, and even in modern iterations of the game, these classic cheats are often referenced or adapted as Easter eggs.