Foil is a word card game in which players draw and discard letter cards until one player can make words using all the cards in his or her hand. All players then shuffle the letters of words they have made and then have five minutes to unscramble the words of their opponents. Players score for words they have made, opponents' words unscrambled, and for forming words that no opponent unscrambles. One of the 3M series of adult strategy games known as "bookshelf games," Foil was designed for 3M by game designer Frederick Herschler.