Cheese Matter is a very simple and straightforward multiplayer shoot-em-up game that can be played by two people in close physical proximity to each other, using either iPhone or iPod Touch devices which have built-in Bluetooth.

The story is ....

The Secret Service is trying to keep the discovery of dark matter a secret from the public as they have recently found it has powerful effects which have not yet been fully tested.

To ensure everything remains TOP SECRET whilst these dark matter experiments are carried out, they have set up a Cheese Matter™ manufacturing plant as a front. To the average person it looks just like cheese, but in fact it's really dark matter in disguise. Once consumed it enables you to walk through physical barriers!

A mouse in the factory has eaten some Cheese Matter and now has the ability to pass through walls. The only way the Secret Service can stop the mouse before it escapes is to send in an Agent who has also been contaminated.

Both devices need to download and install the game. Once you’ve connected to each other's device via Bluetooth, you'll be told which side you're fighting on; either the Mouse or the Security Agent. To attack your opponent, either shoot or throw cheese at them. Each player can pass through Cheese matter, but cannot fire through it. The first player to reach 10 kills wins.

source : itunes.apple.com