In the middle of the city mysterious portals appeared. At first, innocent-looking bright circles, they have let in the evil to your world. No one knows what these monsters are for certain. One thing is clear – they did not come for a tea party and definitely are not friendly. Resist the waves of enemies as long as you can. Wait for the monster commander to appear. You can recognize it very simply and it is much more resilient. A monster who will survive long enough to send you to hell. Use all your abilities to survive this battle. Have fun.