With high quality first-person shooters like id Software's Doom Resurrection and ngmoco's LiveFire/KillTest hitting the iPhone, I'm not surprised to see this programmers attempting to bring their favorite FPSes to the mobile system, like this unofficial version of Valve's Portal.

The group that uploaded this short demonstration provided very few details behind the fan-made creation, other than it spent three weeks with Unity to make it happen on an iPhone 3G. Hopefully they'll reveal more about continuing the project soon!

[Via Wonderland]