I like the concept. But it was unrealistic and it was distracting

The only plausible and realistic explanation would be if aliens kidnapped humans to commit psychological experiments on them. Or aliens came to earth in the future when humans long gone and use their dna to study them.

Otherwise it would not be possible. 333 floors buildings dont exist not in surface, not undergrroud. With so much concrete for walls it would be mega expensive to build such prison "for psychological experiment" . Even if it takes place in the future.

1. There is no way that platform would contain food for 600 people. They had freaking watermelons there! Who take a lot of space instead of meat.

2. Tableware was from glass and was broken all the time. People would cut themselves and eat glass.

3. Woman who brought dog into that place was beyond dumb. What did she expect to happen to her dog there? It would live a happy life? Bad script decision. That character made no sense at all. Her putting some salad and tomatoes on plates and telling people below that there are enough calories for a day? LOL. Of course no one listened to her.

4. That dog was not eating much. Yet was very calm when food arrived. In reality that dog would be constantly hungry since owner didnt gave it food being too busy putting salads on plates.

5. People from other floors would be constantly talking with each other as all inmates do. Out of boredom. They could hear each other for 5 floors at least. Yet in movie no one talked and everyone hated each other.

6. That woman with child would never be able to get down for so many months. She could kill 5-8 other inmates but would be killed eventually. It was not realistic.

7. Magic child who survived on level 333 was just a McGuffin. It made absolutely no sense.

8. For guards to know that someone took something there would have to be cameras on every floor and people to watch them.

9. Walls would be in graphity and marks. Because inmates dont have anything else to do. But we saw them clean and only occasionally our characters were scrambling few lines.

10. Our poor characters decided that sending food or child will send a message but it was pointless. People who torture inmates like this - dont care. And there would have to be endless supply of new inmates. Since all people below level of 70-100 would die every week.