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This map is second map for new players. When you enter the map you have to choose 3 different gamemodes to play - easy, medium , hard. The map is only for 4 people , you can play solo or play with team. Bosses spawns every 5 waves and give specific drops with small chance. After beating this map for first time you get Yellow key
The map is on lobby first floor, from left and right of spawn. The map design was made for the sewer system, which is where the map's name comes from.