AppAdvice writes: "V is for Vortex is the second game from Jonathan Mulcahy, How I Hate the Night Studios, continuing his series of letter is for object games. The game is based on the super popular game Portal, and this is the first portal type game for the iPhone.
If you're not familiar with Portal, you shoot a portal to one place, and shoot one to another place, and walk into one, and come out of the other one. In the actual Portal game, the portals have to be attached to walls, but V is for Vortex allows you to shoot them anywhere on screen. You're goal is transport around obstacles to make it to the exit of each level."