The "Ready or Not [v20221210]" update, also known as Adam Hotfix #1, introduced major technical overhauls including Physically Based Lighting (PBL) standards and improved AI sight sensing through objects. This December 2022 update also added new content like the Data Center map and improved gore and death animations to enhance multiplayer synchronization. For full technical details, you can find the complete change logs on the SteamDB Ready or Not Patch History .