From the back of the box:
The Complete Half-Life 1 collection. Includes: Half Life©, Opposing Force©, Blue Swift© and Team Fortress Classic©.
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Half-Life spawned a franchise of best-selling and critically-acclaimed single player and multiplayer action games. This amazing collection offers four of those games in one package: The original Half-Life, it's two official add-on packs plus Team Fortress Classic, one of the most popular online action games of all time.
ALSO INCLUDES
OPPOSING FORCE©
Winner of numerous awards, including the Academy of Interactive Arts & Science's Game of the Year honors. Offers single and multiplayer content.
BLUE SWIFT©
Battle fierce opponents and explore restricted areas of the Black Mesa Research Facility. Also includes new items for online play.
TEAM FORTRESS CLASSIC©
Engage in team-based warfare as Medic, Soldier, Sniper, Engineer or one of the five other roles. Each has unique weapons, items, and abilities.