Copyright (c) 2003 Grupo de los Lunes
This game is played on the following 9x9 square board:
Black's turn. A possible move for Black would be inserting a pair of stones at , placing a black stone at  (making a group of size 3) and the white stone at .
This way, the cell at c1 is unusable, and White cannot connect  with the two white stones above.
The game is ended. The marked stones refer to the three largest groups for White and Black.
Each final score is the sum of the squares of those groups sizes. So, White = 72+62+52 = 110 and Black = 82+52+52 = 114.
The "Grupo de los Lunes" is a sporadic group of players dedicated to play and to create abstract games. Tonga was designed and tested by Ariel Arbiser, Pablo Coll, Alejandro Donnantuoni, Marcos Donnantuoni, Rodolfo Kurchan, Oscar Lagioia, Pablo Milrud, Enrique Pavese, Gustavo Piņeiro, Jaime Poniachik, Ivan Skvarca & Pablo Suarez.
Tonga was the second place at the 2004 Shared Pieces Game Design Competition.