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Delete this: int board[d][d]; The reason is that board has already been declared globally int board[DIM_MAX][DIM_MAX] and filled with values by init(). Int board[d][d] declares new, local variable an …

output "ftw" doesn't mean by itself that all is fine. The first line of check50 error says that something is wrong with "5" tile. And indeed, it is. The positions in the beginning are: "5" is at [1] …

You only need to delete this and the code will work: int board[d][d]; The reason is that the global variable board is declared above and can be used by any function int board[DIM_MAX][DIM_MAX] …

Well, now you correctly check if the move tile and the blank tile are next to each other. It's not the shortest and not the most stylish way to do it, but OK. Then, in theory, you need to swap these t …

Why do you loop till j < d - 1 not j < d? For board 3*3, you miss board[0][2] so should return false for board[1][0]. However, I do not understand why you are stack in an infinite loop. You should re …

The initial position of blank tile is board[d-1][d-1], not board[d][d]. Other issues: When checking tiles around the blank one, you go outside of the board borders, if the blank tile touches the bo …