 If you liked
Gyakkyou Burai Kaiji: Ultimate Survivor
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 ...then you might like
Selector Infected WIXOSS
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I know these seem totally different, and the art styles are polar opposites, but they actually feel the same at times. They are both based around high stakes games with a focus on psychological aspects and mind games. Kaiji is far grittier, and WIXOSS has some high-school slice-of-life elements, but both are dark and a bit twisted in a similar way. I'd recommend both to any fans of psychological type anime.