Kotaku giving us the first look of Valve’s upcoming Portal game. It is a bit similar with the portal concept from Prey and slapped it on a gun–you can shoot them into walls and floors to solve all kinds of crazy puzzles, teleporting objects around and stuff. Looks like a total mindbender.” GameSpy is reporting that Portal is being designed as a single player game in the Half-Life universe and will ship will Half-Life 2: Episode 2. More on video…