Copyright (c) 1980s David Balmer Jr.

This game is played on an empty 10x10 square board:

DROP - Each player drops a stone into an empty cell that does not belong to no player.
A cell belongs to a player, if he has a stone on it, or the cell is adjacent (diagonal and orthogonal) to more of his stones than of his opponent.
GOAL - When no player can drop no more stones, wins the one who controls more cells.

An example

The green dots denote the cells owned by White, while the red dots denote those owned by Black. If Black drops a stone at cell [1], the unowned cell e5 will belong to Black, since there would be two black stones, against one white, adjacent to e5. 

More information can be found at Mark Thompson's website.