when they walk out of the lab, theyre in a hallway, the alarms get set off and theese enemies try to stop you: scientist, ceiling gun, and a turret like the player, when they move on, there will be a shop to sell loot and buy different guns, puzzles, and new enemies such as the spider turret, drone, and the mech, the final boss is a mega mech, the final boss makes sevral appearances, evrey time its defeated, its stronger, there are also pets that can help you, there are also puzzles to progress