Portal 2

Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry accolades and created a cult following.

The single-player portion of Portal 2 introduces a cast of dynamic new characters, a host of fresh puzzle elements, and a much larger set of devious test chambers. Players will explore never-before-seen areas of the Aperture Science Labs and be reunited with GLaDOS, the occasionally-murderous computer companion who guided them through the original game.

The game’s two-player cooperative mode features its own entirely separate campaign with a unique story, test chambers, and two new player characters. This new mode forces players to reconsider everything they thought they knew about portals. Success will require them to not just act cooperatively but also think cooperatively.

Note:Portal 2 grants access to the Source SDK and SDK Base games. Its store page does not mention this.

Features

Portal 2 engine branch introduces:

Improved shadow mapping: The entity env_projectedtexture is used extensively throughout the game. Compared to previous implementations, it has higher default resolution, better edge filtering, and support for the caching of shadows from static objects.
Sound operators: For defining complex audio behaviour.
Blob particles: Used to render paint.
Video playback on materials: Added support to render Bink Video in-game on surfaces.

Additionally, when it's come to the console port, unlike the PS3 version of The Orange Box, Portal 2 has been properly optimized for the PlayStation 3, while also integrated with Steam (Steamworks, no longer available since 2016).

Chapters

Toggle chapters Portal 2 ChaptersToggle chapters
The Courtesy Call	The Cold Boot	The Return	The Surprise
The Escape	The Fall	The Reunion	The Itch
The Part Where He Kills You	Co-op