1. Josef Kleber Avatar Josef Kleber
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Number Link

Link all the same numbers or letters in each case by a line. The lines can run horizontally, vertically and in 90 degree angles. Each cell must be traversed by exactly one line. The lines must not intersect. Here’s a little self-explanatory example:

Number Link

#!latex
\begin{numberlink}
  \framepuzzle
  \numberlinkcell{2}{1}{B}
  \numberlinkcell{5}{1}{C}
  \numberlinkcell{2}{2}{C}
  \numberlinkcell{4}{2}{D}
  \numberlinkcell{3}{3}{A}
  \numberlinkcell{4}{3}{E}
  \numberlinkcell{1}{4}{B}
  \numberlinkcell{1}{5}{A}
  \numberlinkcell{3}{5}{E}
  \numberlinkcell{4}{5}{D}
\end{numberlink}
\hspace{1.5cm}
\begin{numberlink}
  \framepuzzle
  \numberlinkcell{2}{1}{B}
  \numberlinkcell{5}{1}{C}
  \numberlinkcell{2}{2}{C}
  \numberlinkcell{4}{2}{D}
  \numberlinkcell{3}{3}{A}
  \numberlinkcell{4}{3}{E}
  \numberlinkcell{1}{4}{B}
  \numberlinkcell{1}{5}{A}
  \numberlinkcell{3}{5}{E}
  \numberlinkcell{4}{5}{D}
  \link{\tikzpath{4}{3}{8,4,8}}
  \link{\tikzpath{2}{1}{4,8,8,8}}
  \link{\tikzpath{2}{2}{6,2,6,6}}
  \link{\tikzpath{1}{5}{6,2,2,6}}
  \link{\tikzpath{4}{2}{6,8,8,8,4}}
\end{numberlink}

You will find the current release in the Downloads tab and on CTAN.

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