LINE 'em UP
This game is played behind a curtain, back by the big doors.  The main prize is a car, but there are three other prizes too--two 3-digit prizes and one 2-digit prize.  You are given the first digit in the price of the car, and you are also given the last digit.  The second digit is one of the three numbers in the price of one of the 3-digit prizes.  The third digit is one of the two numbers in the price of the 2-digit prize.  The fourth digit is one of the three numbers in the price of the other 3-digit prize.  You must choose one digit from each prize for the second, third, and fourth digits in the price of the car.  If you are right about all of them, you win the car.  If you are wrong, however, all is not lost.  As in many other games, you get a second chance.  Before you take your second guess, though, you are told how many of the numbers you got right (either 0, 1, or 2).  If, after your second guess, you have the price of the car right, you win.  If it's still wrong, you don't win anything.
HOW TO WIN
On your first guess, there's really no advantage to try to get numbers wrong, so try to guess what you think is correct for each digit.  If you have all 3 right, you win.  The strategy changes if you have it wrong, depending on how many numbers you have right.  If you got 0 numbers right, you have to change them all.  You know what the middle number is--whatever number you didn't try before.  For the second digit, just decide what number is right by what kind of car it is.  For the fourth digit, just use whichever number looks better, and don't use a digit already in the car price.  If you have 1 number right, decide if you have the second number right.  If you think it's right, change the third and fourth digits.  If you think it's wrong, change the second digit and one other digit.  If you have 2 numbers right, again, decide if you got the second digit right.  If not, change that number.  If you think it is right, change one of the other two numbers.  Again, the numbers will usually be all different, so don't try 7 for both the third and fourth digits.
Schmolik's Line 'em Up Page
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