main.tex

% arara: pdflatex
\documentclass[border=1cm]{standalone}
\input{macros}

\begin{document}
\begin{tikzpicture}

  %% matrix of letters
  \pgfplotstabletypeset[
    font=\sffamily,
    assign column name/.style={%
      /pgfplots/table/column name={\footnotesize\itshape\ttfamily\textcolor{gray}{#1}}
    },
%    header=true, % not work
%    every head row/.style={output empty row}, % not work
    string type,
    skip coltypes=true,
    typeset cell/.code={%
        % this here is more-or-less the default implementation, but it
        % substitutes '&' by '\pgfmatrixnextcell':
        \ifnum\pgfplotstablecol=\pgfplotstablecols
            \pgfkeyssetvalue{/pgfplots/table/@cell content}{#1\\}%
        \else
            \pgfkeyssetvalue{/pgfplots/table/@cell content}{#1\pgfmatrixnextcell}%
        \fi
    },
    begin table={%
      \matrix (board) [%
        matrix of nodes,
        store number of columns in=\lastcol,
        store number of rows in=\lastrow,
        column sep=2pt,
        row sep=2pt,
        cells={nodes={%
          black!80,
          text depth=0ex,
          anchor=center,
          minimum height=2em,
          minimum width=2em,
          align=center,
        }}%
      ] \bgroup%
    },
    end table={\egroup;},
  ]{\mytable}

  %% outer frame
  \draw (board-1-1.south west) rectangle (board-\lastrow-\lastcol.south east);

  %% frame numbers
  \foreach [count=\i from 0] \y in {2,...,\lastrow}{%
    \node[left row numbers] at ([xshift=-1em]board-\y-1.base){\i};
  }
  \foreach [count=\i from 0] \y in {\lastrow,...,2}{%
    \node[right row numbers] at ([xshift=1em]board-\y-\lastcol.base){\i};
  }
  \foreach [count=\i from 0] \y in {\lastcol,...,1}{%
    \node[bottom row numbers] at ([yshift=-.5em]board-\lastrow-\y.base){\i};
  }

  \input{./game_boards/current.info}
  \input{./game_boards/current.solution} %% <- comment this to hide solutions


\end{tikzpicture}%
\end{document}