Half Life 2 Episode 2
Half Life 2 Research and Development Mod
Updated 17 July 2009, fixed several issues & added a dynamic crosshair when using the keypads & lab buttons This is the installer version. Hopefully it should fix an issue with the mod not showing up on steam games list at all.
Research and Development is a puzzle-centric mod for Half-Life 2: Episode Two featuring an unarmed player but plenty of violent mayhem.