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Anomaly 404

Also known as Anomaly 404, a4, anomaly 404

Don't trust your eyes. A spot-the-difference horror with photography and a mysterious story. Explore 3 levels, find 100+ anomalies, and manage your sanity — mistakes warp reality. Uncover the truth of Project 404!

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Last update

25 Jun 2026

Original sources

Latest update

Patch notesPublished 18 May 2026

v2.0.0Update 2.0.0: New Content & Progress Overhaul

Each anomaly now has its own unique ID. Added a 3D anomaly board that displays your anomaly search progress. Added an anomaly gate and a dozen new random events. Added a new achievement "Anomaly Gate". Added anomaly pai…

5 changesGameplay

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Latest updates

Update history

Browse past updates and patch notes for this game.

9updates

April 2026
The mistake hint system (for missed anomalies) has been completely redesigned: Each anomaly now has its own unique thumbnail. When leaving a room, any mistakes made will be displayed on the monitor (can be disabled). Yo…v1.4.02 changesGameplayPatch notes28 Apr 2026
Alternative Ending: Added a new secret ending and a corresponding achievement. Ending: The main ending cinematic has been updated. New Difficulty: Added "Easy" mode (Limited Achievements & Secrets). Settings: Added FOV…v1.3.56 changesGameplayUI/audioPatch notes22 Apr 2026
Added Ambient Events: The bunker has become more unpredictable. Level 2 Expansion: Added a second interactive element. Every location now features at least two objects to interact with. Audio: Normalized music volume ac…v1.3.05 changesGameplayUI/audioPatch notes16 Apr 2026
Update 1.2.5: Level Statistics & UI ImprovementsAdded Level Complete Screen: Now features detailed stats (Playtime, Mistakes, Photo Accuracy) after finishing a level. Future Plans: Level Rankings (S/A/B/C) are planned for future updates based on these stats. Updated…Announcementv1.2.52 changesGameplay12 Apr 2026
Added new interaction with the object Added new document Added secret anomalous item Added two new achievements (including secret) Thank you for your feedback! It helps us make the game better.v1.2.04 changesGameplayStore09 Apr 2026
Update 1.1.5: Fast Restart & ImprovementsAdded fast restart after death. Anomaly hint can now be toggled in Settings. Replaced the menu closing sound. Updated Localization. Minor fixes. Thank you for your feedback! It helps us make the game better.Announcementv1.1.53 changesGameplayUI/audio08 Apr 2026
Update 1.1.0: Added Sprint & ImprovementsImproved footstep sounds. Added Sprint (Shift/Ctrl). Updated Instructions. Minor fixes. Thank you for your feedback! It helps us make the game better.Announcementv1.1.03 changesGameplay05 Apr 2026
ANOMALY 404 IS OUT NOW! Get it now with a 33% launch discount! https://store.steampowered.com/app/4282420/Anomaly_404/ A huge thank you to everyone who added Anomaly 404 to their wishlist and followed our development. Y…1 changeStore03 Apr 2026

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