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I think i do,
but what i posted before does what you have asked I believe.

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Enter a number: 12

The user enter the number 12. so the if statement should...

public void move(int tileNumber) {
if (!isValid(tileNumber)) {
return;
}

for (int r = 0; r < boardSize; r++) {
for (int c = 0; c < boardSize;...

Here an example

you enter in 12 and the move method will switch the 12 with the empty space like so.

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but if you enter 12 again it i will not...

I am building a class called TilePuzzle and it is a text base game and it looks like this.

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The way I programmed the move method it looks...