From the Rulebook:Select and shuffle up to FOUR Battle Discs at a time. Place them into the plastic ball and shake it. Open it and 'slam down' the ball-half containing the discs. The other players do the same. Once all the players have their pile of discs in front of them the battle begins.Each player places the discs in a straight line in the order that they have come out of the plastic ball. Place the matching figure next to the disc.Starting with the first disc, each player flips their disc into the air. How it lands determines who 'wins the battle' and puts the other player's figures out of the competition. The disc with the greatest power rating (number of stars) wins. A tie of the highest numbers has to be flipped again until there is a winner.Play continues until all the figures are defeated except for the remaining one who is the champion. - BoardGameGeek