It's like classic Tic Tac Toe, but with a twist, you can play on a 3x3 to 15x15 board. This game includes scrolling, zooming, and settings (available at the bottom of the iphone settings panel). Settings include: Grid size, your/iPhone's pieces, and difficulty levels. Yup, you can pick your pieces, you're not just stuck with the classic X's and O's. In fact, any key you can find on the iPhone keyboard, is a character that you can use! The difficulty levels include: Easy, Normal, Hard. Demo Version Available: 6TacToe.