Your planet is being attacked by a Space Hydra and you're the only one that can save it. In order to survive the attack of the beast, you must choose your the element of your defender wisely, othewise your attack won't be effective. Win stones to improve the different attacks of your defenders and overcome the new visits of your unfriendly visitor from space. There is six different elements, so you must develop your defenders strategically. Spend your stones wisely, to be prepared for any element combination of the Hydra. Game features: Doesn't require Internet connection. Short game sessions. It is easy to understand but it's difficult to find right combinations to advance fast. You play against the clock so it's quite adranalinic.