Kugeln.io is a cool MMO game where you will fight against multiple enemies at once. The mission is to dominate the leaderboard as soon as possible. Pick out the game mode that you want and you can engage the battle with other opponents for free. Each of them will bring to you unique missions. Aside from using the normal gun, you are able to throw a grapnel or control a machine gun. Try to keep an eye on your health to survive! Good luck!