Number Scrabble (original) (raw)

Number Scrabble (also known as Pick15 or 3 to 15) is a mathematical game where players take turns to select numbers from 1 to 9 without repeating any numbers previously used, and the first player with a sum of exactly 15 using any three of their number selections wins the game. The game is isomorphic to tic-tac-toe, as can be seen if the game is mapped onto a magic square.