 If you liked
Gyakkyou Burai Kaiji: Hakairoku-hen
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 ...then you might like
No Game No Life
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It's true that the themes and feels of these two anime couldn't be further apart, but the gaming and gambling aspect is predominant in both, and NGNL is as accessible as Kaiji as most of its games are made up. Plus, they're both made by MADHOUSE.