Ever wish Portal was a little more portable? Well wish no longer - GBATemp forum-goers Smealum and Lobo are crafting Aperture Science, a homebrew Portal game that can be played on a Nintendo DS. You can download a playable build right off Smealum's website now, but keep in mind that Aperture Science isn't complete, and the game requires a flash cart to play it.
The game's story centers on Doug Rattman, the Aperture scientist responsible for the infamous "The cake is a lie" scribbling, as well as the man who saved main protagonist Chell from death between the events of Portal and Portal 2. There's also a level editor, should you be feeling creative.