Shellshock.io is a shooting game in IO games series. When you spawn in the arena, you will direct an egg killer armed with a variety of weapons. You undertake a big mission which is to finish off all online opponents using your equipped weapons. You need to make your way through the arena hunting down as many other eggs as possible then quickly crack them all while defending yourself from being cracked by others. Nobody is a friend here! Therefore, you must play aggressively and always use your cunningness to outplay the opponents. Through over time, you must watch out for your ammo count as it can run out anytime, then you must go gather supplies from the ground or from the ones that were destroyed. In case your health is nearly out, you should reach another corner of the map then wait for it to be refilled. Put your efforts into accumulating skills until you can reach the top rank on the leaderboard.