Apple iTunes has a Free iTunes App Sale: You Against Me (normally $0.99).

About

You Against Me is a turn-based card game where players take turns trying to lock as many squares as they can by claiming and stealing numbers on the game board. It’s easy to learn and quick to play. The more you play, the more strategy you develop and the harder it is to put down.

Requirements

• Requires iOS 7.0 or later
• Compatible with iPhone, iPad, and iPod touch
• This app is optimized for iPhone 5