If you liked
Touhai Densetsu Akagi: Yami ni Maiorita Tensai
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...then you might like
Gyakkyou Burai Kaiji: Ultimate Survivor
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Both created by the same author with suspense, strategy, and gambling. Similar art styles. Though I don't recommend you watch it if you don't like/understand mahjong.
If you liked
Monster
|
...then you might like
Death Note
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I don't want to sound like a broken tape recorder and just state the obvious. Yes; these are both mystery/thriller/drama/crime. Yes; it involves mind games and the debate of good vs. evil. Though the main difference that people leave out is that Monster is more mature in the sense that the majority of the characters are full grown adults with hardships, motivations, and not the "I'm crazy because I laugh a lot" aspect that most shows portray. The world of Monster is so believable that it seems like an obscure story that the world forgot about. I admit it's 74 episodes and a bit slow paced but it's totally worth it. After watching Death Note and moving on to this is the perfect move.