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Master Key
This is the only pricing game played in 2 spots--it starts on the turntable, but then it goes to the center stage (probable the beauties roll it there).  There are three prizes in this game, and the third is always a car!  There are three locks in this game that go with the prizes, one lock for each prize.  These locks are in the middle of the stage, but the contestant starts at the turntable.  This is where the 5 keys are and the 2 small prizes.  To win the keys, the contestant must correctly guess which one of two prices for those prizes is correct.  In this game, however, the first digit of the second choice is ALWAYS the same as the last digit of the first choice.  For each price the contestant gets right, s/he get to choose one of the 5 keys, so the contestant can get up to 2 keys.  There is one key for each of the three prizes, one master key (where they get the name of this game from)which opens all three locks to all three prizes, and there is one key which doesn't open anything (the "nothing" key, as I call it).  The contestant wins whatever prizes s/he "unlocks."
HOW TO WIN
Like Secret "X," you don't have very good odds of winning, but there are a few secrets that can help you.  First, the price for the small prizes usually ends in 0 or 5.  Also, the correct price for this game is usually the second price.  As for picking the keys, there is no way to tell exactly which key is which, but there do seem to be some trends.  The  5th key is probably your best bet (chances are you'll win the car at least if you pick this key).  The 2nd and 4th keys tends to be the "nothing" key frequently, or the key that opens only the 3-digit prize, so you may want to avoid those keys.  Again, this won't hold always--the day you get on the show and play this game could be the day the 4th key is the master key and the 5th key is the "nothing" key.
Schmolik's Master Key Page
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