 If you liked
No Game No Life
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 ...then you might like
Build Divide: Code Black
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Both are set in a world where many things (if not everything) are decided through games. Both anime have a main guy who’s kinda op and a bunch of girls surrounding him who are kinda useless (that changes in S2 though). Both have this concept of “God” (here it’s called “King”) who will make your wish come true if you defeat him.