Counter-Strike: Source - PC Single-elimination, team-based online shooter Completely overhauled with better graphics, new characters, items, and environments Package includes Half-Life 2: Deathmatch and Day of Defeat: Source Real-world physics adds depth the gameplay Internet connection required for online play Single-elimination, team-based online shooter Completely overhauled with better graphics, new characters, items, and environments Package includes Half-Life 2: Deathmatch and Day of Defeat: Source Real-world physics adds depth the gameplay Internet connection required for online play