The game board is divided into hexagonal cells of different colors. To win you need to conquer more cells than your opponent. To conquer the cell is simple - just wait for your turn, choose a color of a neighboring cell and it will be yours.
When you create a game, you can specify the map size - from small to large - and limit the time of the turn. If the player did not choose the color for the specified time, the turn moves to the another player. Three consecutive missed turn - and the player loses.