30. Dice. Dice may be used in a game to determine whose turn it is or how many spaces to move a piece, e.g., in Chutes/Snakes and Ladders. This is not a problem of casting lots, which is assur on Shabbos (שו''ע סי' שכ''ב ס''ו ), or of gambling since the players do not stand to make any profit; they are merely competing to win a game, and it does not resemble business (שש''כ פט''ז אות ל''ד ).
31. Sand timer. A sand timer with marks that show how much time has elapsed may not be used on Shabbos, as measuring time is assur when not for a mitzva (שו''ע ש''ח סנ''א ). However, a sand timer without markings that just shows when a certain amount of time is up and just ensures that everyone plays for the same amount of time may be used during the game (ע''פ פמ''ג סי' רנ "ב משב''ז סק''ז ).
