Hero co-op survival game where up to 6 players fight through 45 levels of enemy waves and 5 insane boss battles. Take control of 1 of 22 unique heroes and enter the arena with a total of 1, 10, 30, 50, or 100 lives that you and your team must defend from the enemy. Each wave spawns 10 units per active player, keeping it balanced and fun for any number of players. Players must buy, combine, and upgrade items to increase damage, health, and armor to increase their chances of survival. Boss fights in the game are actual boss fights and will challenge players during the encounters. There are many challenges and obstacles standing in the way of you achieving your Killing Spree. Do you have what it takes to succeed?