 If you liked
Gyakkyou Burai Kaiji: Ultimate Survivor
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 ...then you might like
Hunter x Hunter (2011)
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Both series have intelligent characters and in many scenes, require them to think to survive. Also, they are both made by Madhouse.
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Recommended by SilverChariotx
Hunter x Hunter and Kaiji are both start off with a guy sailing on a ship and then proceeding to participate in challenge in which they quickly make friend with three other challengers. The two anime are made by the same studio, Madhouse, and they both get way better as their story progresses.
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Recommended by lysanthrope