On a far distant planet three life-forms vie for dominance: the carnivorous Kroguls the herbivorous Grabits and the vegetable Zherbes. Players try to expand their populations of these, at the expense of their rivals naturally .The ultimate goal is to to achieve an exclusively plant population in any three of the 24 concentrically symmetrical areas into which the board is divided. The system is entirely luck-free. - BoardGameGeek