 There are a number of pricing games where, even if you know the  prices of all of the items in advance, there is no guarantee you  will win. For example, in "Secret X", even if the contestant gets  both prices correct, there is only a 2/3 chance of winning the main  prize. (One of the reasons "3 Strikes" was changed to have one  "strike" chip instead of three was, when there were three strike  chips and five digits in the car price, there was a 5/8 chance of  losing even if you knew the price of the car in advance.) On the  other hand, there are games such as "Hole in One (or Two)" and "Let  em Roll" where the contestant can win even without getting any  prices correct.