Zenterfold
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Sixteen distinct beings were living about their daily lives as they normally did, though what constituted a "daily life" for each of them varied significantly. Sixteen existences were about to be completely upended, no matter how distinct each of those existences were. Despite how different they all were, they would all experience one very specific thing in common; someday, sometime, they would find that everything around them went completely dark. Whether they just went to sleep that night, were mysteriously knocked unconscious, or were on the verge of death, they all experienced a similar lack of consciousness that could have lasted forever for all they knew.
A moment later, or seemingly a moment later, they all woke up.
Consciousness returned, bringing with it light and feeling. All those who awoke found themselves in a soft but slightly uncomfortable single bed with nondescript white sheets. The room each awoke in was nothing special. There was one bright overhead light that illuminated white walls and a white tiled floor. In addition, each side of the room contained one white wooden desk and sliding doors that led to a standing dresser. If the dressers were to be checked, each would contain sets of clothing that each individual were used to. Of course, if one never did change their clothes or did not have a lot of clothing where they came from, the dressers reflected this as well.
Each room contained just a single locked door. No force was going to make it budge.