Kaiji - Ultimate Survivor

Kaiji - Ultimate Survivor is also listed as Gyakkyou Burai Kaiji: Ultimate Survivor on some trackers — same show, different title convention. It's a TV series across 26 episodes out of MADHOUSE. It's finished airing, so the whole thing is watchable start to finish.

On the shelf it sits under Psychological and Thriller — worth knowing if you're comparing psychological anime specifically. If Kaiji - Ultimate Survivor works for you, Death Note and Tokyo Ghoul are close matches — see the full related list below.