Lincolnite

Other interesting board-game rule variations include the blank-tile substitution rule in Scrabble. Under this rule, if somebody puts a blank on the board to signify "R,' say, and later you wind up with an "R' in your rack, you can substitute the real letter for the blank and re-use the latter. This keeps the blanks in constant circulation, which can be useful toward the end of the game when everybody is getting down to the nubs, letters-wise.