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>> ZAMYLA CHAN: To win the game
of 15, the tiles have to be

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in a specific order.

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And the one function checks
whether the game is won.

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It returns true if the game is won and
the tiles are in the correct order,

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and false otherwise.

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>> So to win the game of 15, tiles have
to be in increasing order, with the

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blank tile at the bottom right corner.

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So how do you check whether the user
has moved the board into the right

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orientation?

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Well, you'll iterate over the board and
check the values to make sure that

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they're in the right place.

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To do this, you could use nested
for loops just like you did

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in Draw and in Init.

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>> There are a couple of ways to check
and validate whether the board is

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correct in a winning though.

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If you go from left to right, starting
from the top row down, then every

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number must be greater than
the previous one.

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Be careful about what value you've
chosen for your blank tile, though.

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>> Or you could use a counter variable to
ensure that each value is in place if

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you come up with some sort of
formula to represent this.

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So have fun experimenting
with the math.

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Once you come up with a way, return true
once the user has won the game.

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>> But if any value is incorrect,
return false.

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The user has to continue moving, because
they haven't won the game yet.

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Once you implement this check, and along
with initialize, draw, and move,

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you've finish the game of 15.

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Congratulations, and have fun playing.

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My name is Zamyla, and this is CS50.

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>> [MUSIC PLAYING]