Copyright (c) ? Fabian Maeser
This game is played on an empty square board (say 6x6):
After the marked drop stones, the orthogonal adjacent empty cells are also occupied.
Regio can also be played with stones of just one color. This game fits the Combinatorial Game Theory criteria:
|Two players moving alternately.|
|Both players have full information about the game-state.|
|The first player that cannot move loses the game.|
Check this article studying Regio using CGT.