[Rise]

Написал шафл, потом почитал автора плагина: "At first, I was just going to randomly place all the elements, but I was worried that this could potentially lead to a board that was not solvable".

рони, думаете это правда?

Оставлю здесь на всякий случай.

function shuffle() { // Так может получиться нерешаемо?
    for (var row = 0; row < rows; row++) {
        for (var col = 0; col < cols; col++) {
            var _row = Math.floor(Math.random() * rows);
            var _col = Math.floor(Math.random() * cols);
            var piece = board[row][col];
            var _piece = board[_row][_col];
            board[row][col] = _piece;
            board[_row][_col] = piece;
            var left = piece.style.left, top = piece.style.top;
            var _left = _piece.style.left, _top = _piece.style.top;
            piece.style.left = _left;
            piece.style.top = _top;
            _piece.style.left = left;
            _piece.style.top = top;
        }
    }
}