Ratuki is a really fun, easy to learn, and fast-paced game. You build stacks of cards from 1 to 5 and the first person to place a 5 card down and shout "Ratuki!!!" wins all the cards in that stack. Although the game is recommended for players age 8 and up, my 5 year-old is able to play. He loves it. The more players you have, the more fun the game is. It becomes and card slamming frenzy.