Find two teams in a class. Every player gets a number and thinks of two words whose spelling he/she is sure of. Alternately the players of the opposite teams tell each other words and the other team has to spell the word. If the spelling is right the ball goes forward - maybe a quarter of the field. If the word is wrong the player of the opposite team gets the chance to spell it. If it's right the ball goes forward for his team, if not it stays where it is.