Multiple:Option's second DS homebrew release is Snatcher Pilot DS, an adventure game by Konami and an early game of Hideo Kojima (Metal Gear Solid). This game is a demo (hence "ilot") and is based upon the PC-Engine "Snatcher Pilot Disk," but uses the Sega CD version's assets.
Read the readme.txt for more information.
Requires a DS (obviously) and a flash cart, such as a R4. Mostly works with DS emulators, but there are a few issues.