Neunerschiebepuzzle Latex

\usepackage{tikz}

% Nicht schön, aber funktioniert
\newcommand{\puzzle}[9]{
    \begin{tikzpicture}[scale=0.8]
    \draw (0,0) rectangle (3,3);
    \ifnum#1>0
    \filldraw[black!30!white,draw=black] (0+.1,0+.1) rectangle (0+1-.1,0+1-.1);
    \draw (\intcalcMod{0}{3}+.5,\intcalcDiv{0}{3}+.5) node{#7};
    \fi
    \ifnum#2>0
    \filldraw[black!30!white,draw=black] (1+.1,0+.1) rectangle (1+1-.1,0+1-.1);
    \draw (\intcalcMod{1}{3}+.5,\intcalcDiv{1}{3}+.5) node{#8};
    \fi
    \ifnum#3>0
    \filldraw[black!30!white,draw=black] (2+.1,0+.1) rectangle (2+1-.1,0+1-.1);
    \draw (\intcalcMod{2}{3}+.5,\intcalcDiv{2}{3}+.5) node{#9};
    \fi
    \ifnum#4>0
    \filldraw[black!30!white,draw=black] (0+.1,1+.1) rectangle (0+1-.1,1+1-.1);
    \draw (\intcalcMod{3}{3}+.5,\intcalcDiv{3}{3}+.5) node{#4};
    \fi
    \ifnum#5>0
    \filldraw[black!30!white,draw=black] (1+.1,1+.1) rectangle (1+1-.1,1+1-.1);
    \draw (\intcalcMod{4}{3}+.5,\intcalcDiv{4}{3}+.5) node{#5};
    \fi
    \ifnum#6>0
    \filldraw[black!30!white,draw=black] (2+.1,1+.1) rectangle (2+1-.1,1+1-.1);
    \draw (\intcalcMod{5}{3}+.5,\intcalcDiv{5}{3}+.5) node{#6};
    \fi
    \ifnum#7>0
    \filldraw[black!30!white,draw=black] (0+.1,2+.1) rectangle (0+1-.1,2+1-.1);
    \draw (\intcalcMod{6}{3}+.5,\intcalcDiv{6}{3}+.5) node{#1};
    \fi
    \ifnum#8>0
    \filldraw[black!30!white,draw=black] (1+.1,2+.1) rectangle (1+1-.1,2+1-.1);
    \draw (\intcalcMod{7}{3}+.5,\intcalcDiv{7}{3}+.5) node{#2};
    \fi
    \ifnum#9>0
    \filldraw[black!30!white,draw=black] (2+.1,2+.1) rectangle (2+1-.1,2+1-.1);
    \draw (\intcalcMod{8}{3}+.5,\intcalcDiv{8}{3}+.5) node{#3};
    \fi

   \end{tikzpicture}
}

% 1 2 3
% 4 5 6
% 7 8 9
% In das leere Feld 0 eintragen
\puzzle{1}{2}{3}{0}{4}{5}{7}{8}{6}