If you loved Kaiji: Final Game, try Kaiji 2: The Ultimate Gambler
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Tōya Satō, and they both carry the mindfuck, paranoid, unhinged mood tags, and they sit in Drama / Mystery / Thriller territory. If that's the register that drew you to Kaiji: Final Game, the second film will land in a comparable space — through a different lens.
mindfuckparanoidunhinged
What Kaiji 2: The Ultimate Gambler is
Rainy Tokyo streets at dusk a pachinko parlor's neon hum Kaiji toils in underground labor A 14 day deadline to save his fellow workers looms in Tōya Satō's game of survival

