Used as a virtual trackpad for aiming, looking around, and selecting weapons from Gordon's arsenal.

: The "New" Nintendo 3DS is highly recommended over the original 3DS for better performance and stability. Alternatives for Original DS If you are strictly using an original Nintendo DS

: On "New" models, the Circle Pad handles movement while the C-stick controls the camera.

The DS was never meant to run the . However, developer James Grantham and later contributors managed to recreate the experience by building a custom engine from scratch.

You own a legitimate copy of Half-Life for PC to use its game data. Distributing or downloading the valve/ folder without owning the game is piracy.