A. The reason why doomsday keeps coming back in "Doomsday: Last Survivors" is not explicitly stated in the game. However, the recurring doomsday events may be part of the game's lore and backstory, where a catastrophic event or recurring threat keeps emerging to challenge the players. This provides a narrative framework for ongoing gameplay, where players must continually adapt and survive in a changing and dangerous world. Additionally, it adds to the game's overall sense of danger and unpredictability, keeping players on their toes and creating a sense of urgency to find ways to stay alive amidst the ongoing threats.