If there is Arena, then it will happen something interesting, but in this particular case everything depends on you. A character who moves around the site is entirely in your submission and he hopes that your agility will save his life or, at least, prolong it longer. It is worth the hero will appear, immediately begin to arise round prickly creatures, which will try to surround him. If possible, dodge, but no - shoot by pressing the space bar. The green scale at the bottom of the screen is a supply of shooting energy. You can replenish it by collecting emerald balls. Move with the arrows.