| Code | Effect |
| l-Light Amplification | 120 seconds |
| i-Invisibility | 60 seconds |
| v-Invincibility | 30 seconds |
| a-Allmap | Durations of current level |
| r-radiation suit | 60 seconds |
| s-Berserk Strength | Duration of current level (red for 30 sec) |
| IDKFA | Full armor and weapons + all the keys. |
| IDFA | Full armor and weapons but no keys. |
| IDBEHOLD | This will give you special things |
| IDCHOPPERS | Chainsaw |
| IDMYPOS | Displays co-ordinates and angle of view. |
| IDDQD | This puts you in God mode. This makes you invincible without the reverse screen. |
| IDSPISPOPD | Walking through walls. For Doom II the code is idclip. |
| DCLEV | This code teleports to level of choice. For Doom II you can only get to the secret levels: 31, 32. |
| IDDT | To make this code work, you must be in map mode (press TAB). When the map appears, press iddt once and the whole map will appear. Press it again and it will show you were all the monsters and items are. Press it once more and the screen will go back to normal. |
| ALT+IDDT (x5) | When you're in Death Match mode. Go to the map (by pressing TAB) and then hold down the ALT key and press iddt five times. This will show you where the other player is. |
| IDMUS## | The ## symbols stand for any numbers from 01-35. When you enter this code it will take the music of whatever level you enter and play it on the level you're currently on. (This works for Doom version 1.666 or higher.) |
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