Dirt is a procedurally-generated exploration game in which you play as a skeletal cat trapped inside a network of caves with only a pickaxe in hand to dig at the walls and floors. Players can move in any of the four directions available to them, and if they want to dig upwards all they have to do is turn their iDevice upside down to change the gravity inside the room.

While trying to discover the reason you are stuck underground, you'll come across a variety of coloured gems to collect in random cave openings and narrow passages. The pause screen contains a summary of the various gems you have picked up, and it also displays the number of gems required to uncover the next part of the story.

It takes about an hour to play through the entire game, although you can continue wandering around the infinite cavern even after the credits have rolled. Dirt is available to purchase from the App Store for only $0.99.