- The gameplay takes place in an
m * n
board. The most commonly used size of the board is 9 * 6. - For each cell in the board, we define a critical mass. The critical mass is equal to the number of orthogonally adjacent cells. That would be 4 for usual cells, 3 for cells in the edge and 2 for cells in the corner.
- All cells are initially empty. The red and the green player takes turns to place "orbs" of their corresponding colors. The Red player can only place an