Provide a one-minute sand timer and 4x6 chips (in the four player colors). Each player receives the six chips in his color. As soon as the active player places his tile, the timer is started. If a player runs out of time, he turns in a chip and flips it again for another minute, etc. At the end of the game, any remaining chips are worth three points.
Killer Clue (four parts) I. A wise bird that hoots
II. The alphabet letter after W III. The opposite of "east" IV. The season after summer