It's definitely Half Life 2 Episode One gift
But it's Includes 6 items: Half-Life 2, Half-Life 2: Deathmatch, Half-Life 2: Lost Coast, Half-Life Deathmatch: Source, Half-Life 2: Episode One, Half-Life 2: Episode Two

To let everyone be easy that I set it Half Life 2 because HL2 Ep1 and 2 doesn't appeared in Game Library

Add me on Steam once you winner for let me sent you gift of Half Life 2 - Episode One
Btw: Half Life 2 EP 1 and 2 it's on the Tool library