Information for xmlink-5.5.2:

Comment:
Missing Link puzzle for X Window System

Description:
Ideal's The Missing Link, a 4x4 puzzle, riding on the wave of Rubik's
Cube craze.  There are many variations on this theme, including the "6x6"
puzzle and Babylon Tower.  What makes the Missing Link a harder puzzle to
solve is that the 2 center positions rotate together.

WWW: http://www.tux.org/~bagleyd/puzzles.html