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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!

Last update
25 Jun 2026
Original sources
1
Latest update
Patch notes

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
Latest updates

Update history

Browse past updates and patch notes for this game.

9updates

Gallery

In-game media