From the website:
ANGRY SHEEP are in your field!
A game of Crazy Barbarians vs the Wooly Revolution led by Sheep Guevara, Angry Sheep is ridiculous fun in a tube. The basic premise of the game is dice matching. Roll the dice, keep your doubles, and take the re-rolls, all with the goal of stealing your neighbors rebellious sheep. It's not as easy as it sounds, the sheep have ideas of their own, and your Barbarian may be a distracted by frosty and delicious mugs of root beer.