From the publisher's website:

Quiddler is a delightful challenge for rookies and wordsmiths alike. There are two bonuses each round: one for the longest word and one for the most words! The object is to arrange all the cards in your hand into one or more words. There are 8 rounds per game. Start with 3 cards in the first round, 4 cards in the second round, on up to 10 cards in the last round. Players draw and discard until someone forms their entire hand into words using two or more cards per word. Once a player goes out, everyone else gets one last chance to draw and put down the words they have made. Quiddler is called ‘The SHORT Word Game’ because readers of all ages can play and win with short words like ‘at’, ‘is’ and ‘the’. You can even use a dictionary when it’s not your turn. Try to use your high point letters, but don’t get caught with them in your hand!