Using nine 12-sided dice, Krakatoa is one of the most unusual dice games ever released. The dice were divided into three sets of three, colored white, grey, and black to represent respectively steam, ash, and lava. In addition, each side contained not a number, but a colored dot of yellow, red, or blue. The game consisted of six rounds, with each player taking five successive rolls of the dice and scoring after each roll. After the first roll of each round the player would have to pick up a specific set of dice, such as steam, and roll them again, striking at least one of the dice still on the table. Skill in precise dice rolling could result in a high score. Points were awarded for different combinations, such as a set showing all yellow sides for ten points. Strategy came into play as certain target scores and scoring combinations could result in large bonuses. Long out of print, but worth it if you can find it. - BoardGameGeek