This Electronic Arts-published collection presents boxed retail versions of four games from Valve's Half-Life franchise: Half-Life 2, Half-Life 2: Episode One, Half-Life: Source, and Counter-Strike: Source. All four games were previously available as stand-alone or bundled purchases from Valve's "Steam" digital distribution service, and earlier versions were all rated "M" for "Mature" by the ESRB.

From the Manufacturer: Valve's Half-Life series is one of the defining videogame experiences available on the market, and this Holiday 2006 Collection packs together the most popular entries in the franchise. Included are Half Life: Source, Half-Life 2, Half-Life 2: Episode One, and Counter-Strike: Source.

HALF-LIFE 2: EPISODE ONE: Also includes the first new episode for Half-Life 2. Intense single-player action powered by incredibly-advanced AI.

COUNTER-STRIKE: SOURCE: Play the world’s #1 online action game. Powered by the Source Engine, and features new maps, models, and special effects.

HALF-LIFE 1: SOURCE: Experience this special edition of the original, critically-acclaimed single player adventure, recreated atop Source for enhanced play.

HALF-LIFE 2: Winner of over 35 Game of the Year Awards. Sets a benchmark for gaming with its startling realism and physical gameplay.