Firefly Collector s Edition Yahtzee Game: Yahtzee - with an out-of-this-world twist! The Firefly Collectors Edition Yahtzee Game features a collectible Serenity ship cup and custom dice. This Firefly-themed version of the popular dice game is fun for all, especially fans of Mal and his crew of Browncoats! 2 or more players. Ship measures about 9-inches long. Ages 8 and up. Age: 8+ Size: 9-inches long Number of Players: 2 or more