atom4 - 4.1-9+b1 main

Atom-4 is a two-player color manipulation game played with colored
spherical pieces on a board divided into equilateral triangles. The
player who first makes a row of 4 pieces of the right color wins.
However, the players do not directly play pieces of the winning color;
they must construct their winning pieces via color changes that happen
to neighbouring pieces whenever a new piece is placed on the board.
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Atom-4 supports both a curses-based text interface and an X11 interface.