Portal 2: Community Edition Now in open beta on Steam, is a free, community-driven mod that dramatically expands the modding and custom content potential of Valve’s beloved puzzle platformer.
It introduces a suite of powerful new tools and upgrades including
>improved Hammer map editor
>extended VScript scripting support
>dynamic lighting with volumetric fog
>physically based rendering for higher-quality textures and assets
>significantly increased entity and technical limits
>full custom campaign integration
>complete user interface overhaul
Portal 2: Community Edition is designed to be the ultimate platform for both playing and creating advanced maps, campaigns, and mods, removing many of the original game’s longstanding restrictions.
Ownership of the base Portal 2 on Steam is required to download and play it.