While there is no official , you can play the full game on Nintendo hardware through homebrew projects like Xash3DS . This isn't a traditional ROM file but a "port" that runs the original PC game data on a custom engine. How it Works: The Xash3D Engine
: The original Nintendo DS lacks the RAM and processing power to run the GoldSource engine directly. Most "Half-Life DS" projects for older hardware are tech demos or simplified versions built on ports of the 2. Features & Capabilities Full Campaign : Support for the entire single-player "Valve" folder. Custom Controls