From the back of the box: OOgal is a fast-paced exciting game building on the dual classic concepts of word-building of Scrabble(tm) and dice play of Yahtzee(tm). In OOgal, players roll the special dies in an attempt to build words with the greatest point score. Unique 20-sided dies contain all the consonants, while the custom cubes contain all fo the vowels. If OOgal eyes on the special black die is rolled, an OOgal occurs and the score is doubled. A 60-second sand timer keeps the action going while a player races through multiple rolls to build the greatest scoring word. Multiple words, slang terms, and proper names can also be spelled at the discretion of the players. Great game for the entire family at home, at camp, or on the go. Makes a perfect gift!