In this league, both players play on the same grid.
First, each player chooses to color tiles on the grid. Then, an ant move from the center of the grid changing the color of tiles along the way.
To move, the ant play by the following rules :
If the ant is on a colored tile, it turns left, becomes of the tile's color, then the tile become white and the ant move forward on the next tile.
If the ant is on a white tile, it turns right and the tile become of the ant's color, then the ant move forward on the next tile.
At the beginning, the ant has the first player's color and is centered (more precisely on the tile of coordinates (dimension /2;dimension /2)) and its direction is upward
If the ant exit the grid, the game is over.