10 Mind-Blowing Secrets Hidden Across the DOOM Series

The DOOM series is packed with hidden surprises, starting from nostalgic DOOM Easter Eggs to strange and mind-blowing secrets. Let’s make a list of 10 ten most incredible hidden details across the DOOM series.

1. Wolfenstein 3D Easter Egg

Because DOOM and Wolfenstein 3D were both made by id Software, the video games include hidden connections. In some DOOM games, players can find secret rooms that look like Wolfenstein levels, with pixelated walls and old-school enemies.

2. Hidden Developer Messages

In the DOOM series, id Software developers have hidden secret messages in various places, such as walls, menus, and even loading screens. These messages often contain jokes, hints or Easter Eggs for curious players. In DOOM (2016), players discovered hidden computer files that referenced old-school games from id Software’s past, like Quake and Wolfenstein 3D.

3. Daisy

Daisy is the beloved pet rabbit of the DOOM Guy and it’s hidden in various DOOM games. Sadly, she did not survive, which is one reason why DOOM Guy is so angry at the demons. In DOOM Eternal, you can find Daisy hidden in different levels, usually sitting quietly in the background.

4. The Super Turbo Turkey Puncher 3

It’s hidden in DOOM 3, where you can find a hilarious arcade machine where you punch a turkey endlessly in a pixelated fighting game. Even though it’s not part of the scary story, it’s a funny surprise that shows DOOM also has silly moments.

5. Nightmare Difficulty Secret

In DOOM 64 there’s an ultra-hard difficulty mode called Nightmare, but it’s not easy to find. You must enter a special password to unlock it, making it hidden challenge for hardcore players. In this mode, enemies move faster, attack more aggressively, and do more damage. Nightmare mode is a true test of skill, giving you one of the toughest experiences in the DOOM series.

6. John Romero’s Secret Message

In DOOM II , the final boss, Icon of Sin, plays a strange sound when the fight starts. If you reverse it, you can hear John Romero saying, “To win the game, you must kill me, John Romero!” But there’s a surprise – the real boss is not the huge demon! To defeat it, you must find and shoot Romero’s hidden head inside the creature.

7. Classic DOOM Hidden Levels

In DOOM from 2016, you can find levers hidden in different locations. Pulling them opens secret retro-style rooms with original DOOM textures and level design, recreating iconic areas from the 1993 classic. These nostalgic Easter Eggs remind players of DOOM’s long history and evolution.

8. Secret DOOM 64 Ending Connection

Many fans thought that DOOM 64 was a separate story, but DOOM Eternal confirmed that it’s the part of the main timeline. Hidden information in DOOM Eternal reveals that after DOOM 64, DOOM Guy stayed in Hell instead of returning to Earth. Eventually, he became the Dom Slayer, the powerful warrior seen in DOOM Eternal. This secret surprised many fans and changed how they understood the DOOM id series.

9. Commander Keen References

DOOM includes multiple secret nods to Commander Keen, an old platform game made by id Software. In DOOM II, you can find Commander Keen’s helmeted body in a secret level, which hints at a dark ending of the character, Later DOOM video games also include small nods to Keen’s past adventures, showing that developers still remember the classic game.

10. Rip and Tear Origins

The iconic DOOM phrase, “Rip and Tear”, comes from a DOOM comic book published in 1996. In the story, DOOM Guy fights demons in a wild and furious way, shouting: “You are huge! That means you have huge guts! Rip and Tear!” This powerful phrase has appeared in many DOOM video games as secret messages, graffiti on walls, and even spoken lines in DOOM Eternal.

Why DOOM fans love secret hunting?

Many fans love searching for DOOM secrets because it makes the game more exciting. Hidden areas, Easter Eggs, and secret levels add extra surprises and challenges. Finding them feels rewarding and make players feel like true explorers. It also deepens their connection to the DOOM world, turning every discovery into a fun and unforgettable experience.