Half-Life 2 is a science fiction first-person shooter computer game and the sequel to the highly acclaimed Half-Life. It was developed by Valve Corporation and was released on November 16, 2004, following a protracted five-year, $40 million development cycle during which the game’s source code was leaked to the Internet. The game uses the Source game engine, which includes a heavily modified version of the Havok physics engine and was also the first video game to require online product activation.
- Leaked Beta (-4 - September 26, 2003)
- Source Multicore Particle Demo (2915 - October 31, 2006)
- 2342 - used for creating demo of e3_town_04 map (e3_town_02 demo).
- 2345 - used for creating demo of e3_outpost_test map (e3_outpost_1 demo).
- 2364 - used for creating demo of e3_seacliff map (e3_seacliff_1b demo).
- 2371 - used for creating demo of e3_seafloor_01 map (e3_seafloor_sawyer1 demo).
- 2378 - used for creating test version of Kleiner's Lab, Phystown and Bugbait videos (e3_alyx, e3_phys_01 and e3_bugbait_01 demos).
- 2379 - used for creating test versions of Kleiner's Lab video (e3_lab_02 and 03 demos).
- 2390 - used for creating Tunnels (final and test versions), Barricade and Bugbait videos.