Didn't get it but it's great .
Viewing post in DING jam comments
No worries, it’s not just a simple visit level system. The gameplay is actually similar to Exit 8. Basically, the game works in a loop:
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The first floor loop is normal everything is where it should be and you get used to the environment
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After that you keep looping through the same area, but some things might change subtly or disappear. Some changes are obvious, others are hidden, so you need to pay attention to items and their positions. NOTE: changes in lighting or the room’s atmosphere don’t count as anomalies
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If you notice something has changed in the loop, you take the left elevator; if not, you take the right elevator.
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The goal is to reach the 7th floor, which is your office, by noticing these changes and figuring out how to interact with them.
So it’s all about observing carefully and using what you find to progress through the loops.