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So I just sat through all of Sword Art Online - the Gun Gale arc and alternative series are obviously based off the movie "Battle Royale".
What about the many-floor dungeon concept, where's it from? Is it also from a movie or is it from a game?
I like it and I also found it in the ongoing manga "Hell Mode", and I suppose one could say it's also fundamental to Made in Abyss (I've even played Mine in Abyss).
Thanks in advance!