Portal is one of those games that I keep going back to every now and then because it's fun and is a great way to kill time. I love downloading new maps and seeing what challenges other people can come up with. I'd love to see some sort of portable version of this game on my DS, and luck would have it, someone has created just that.
Unfortunately this game is only a homebrew, which means you're going to need to do a little work in order to play it.If you happen to have a DS that is capable of playing such games, then I would definitely recommend checking this one out.
Along with the game, the creator has released a level editor which should keep you plenty entertained. I would love to see something like this released by Valve so that everyone can play.
[via DS Fanboy]