If you're looking for anime similar to Phi Brain: Kami no Puzzle 3, you might like these titles.
Ever since Yugi Mutou completed the Millennium Puzzle his life has changed; he's made friends, learned how to play the card game Duel Monsters and has gained more confidence in himself. After his grandfather is beaten in a duel he is challenged by Seto Kaiba, ranked number two in the world, but Yugi beats him regardless. Now, as a result of his victory, Yugi has attracted the attention of the game's creator, Pegasus. Yugi is then challenged to a dual in an alternate reality where magic brings the monsters to life, but is beaten and his grandfather's soul is taken. In order to retrieve it Yugi must now participate in a tournament against the best duelists in the world, defeat the game's creator, and learn more about the secrets within his Millennium Puzzle!
These are both shounen anime where the characters get involoved with games they enjoy on a much larger and more dangerous scale. Phi Brain is about solving puzzles and Yu-Gi-Oh is about a card game, but at their heart they are both shounen anime with all the usual cliches and character archetypes. Both anime have characters matching wits with villains through either puzzles or the card game.
In both these shows there is at least some attempt to have strategy and tactics play a role in the puzzles or the games, but don't expect anything too complicated from either of them. If you are looking for a stereotypical shounen anime then either of these should suit your needs.
Kaiji Ito is as pathetic a person as they come; a man who gambles his days away, only winning enough to lose significantly more. He hates himself, is riddled with envy for others, but is ultimately too weak to think of a way out of his massive debts. Then one day he is approached by a strange man who offers him what seems the solution of a lifetime – to take a short journey on a ship called Espoir, during which time he will be given the chance to win more cash than he can dream of in a card game like no other. Ever the desperate, Kaiji takes the gamble of his life; however, the game turns out to be far darker than he expected and the hard lessons pile on thick and fast. Now stuck in a closed world of unsavory characters willing to do anything to destroy him, can Kaiji gather enough courage to outwit them all?
These are both high stakes games anime where the players often have to put their lives on the line. Both these anime involve players using strategy and tactics to try and outwit the traps their opponent has set. Both anime have a good deal of variety because the puzzles in Phi Brain are all very different and in Kaiji each arc is about a different game.
Phi Brain is a pretty basic shounen anime and there isn't much depth to either the characters or the strategies they use. kaiji is a much more intelligent take on the high stakes game genre with much more insight into the tactics and the psychology behind them. If you watched Phi Brain but want something a little more meaty in the high stakes game genre then you should definitely check out Kaiji.
Yugi Mutou was a boy who was constantly bullied – until one day he managed to put together an ancient and mysterious puzzle that no one has been able to solve for two hundred years. Now, whenever Yugi's friends are threatened, a strange transformation occurs, and Yugi seems to become an entirely different person. This transformed Yugi is a master of games, and uses these spontaneously-invented games to trap and to punish the bad guys. At the end of each game, his opponent appears to suffer a painful death; but it is soon revealed that this was all in their minds – or was it?
Kimimaro Yoga could use a break. At nineteen years old, he's not only a student at Heisei College of Economics, he's also a part time employee and flat out broke. So when an eerie man offers the boy a special ATM card and an exorbitant amount of cash, Kimimaro gives in to temptation – but there's a catch. In exchange for his good fortune, Kimimaro's very future is put at stake, held as collateral by the Bank of Midas and tied to the amount of yen in his bank account. In addition, he must participate in a special battle every week in the mysterious 'Financial District' – a battle where losing against one's opponent can mean bankruptcy, a fate that carries an unthinkable cost in the normal world...
In the year 2010, on a day called ‘Careless Monday', ten missiles hit the cities of Japan; miraculously, there are no casualties and the event quickly fades from public memory. Some time later, Saki Morimi decides to visit Washington, DC on her graduation trip to America, but that day begins a series of bizarre events. After getting into trouble with the police, she's rescued by a young man who is completely naked save for a gun in one hand and an even stranger item in the other - a phone credited with 8 billion electronic yen and a female voice on the other end called Juiz who will fulfill his every wish. Having no recollection of his past and calling himself ‘Akira Takizawa', the young man accompanies Saki back to Japan in the hopes of discovering who he is. Akira's enigma quickly proves fascinating and Saki decides to help him rather than reunite with her family; but what neither realizes is that Akira is embroiled in a dark game of life and death linked to the Careless Monday missiles. Has Saki just made a terrible mistake, and can Akira unravel his own mystery before they both lose everything?
Six thousand years before Sora and Shiro were even a blink in the history of Disboard, war consumed the land, tearing apart the heavens, destroying stars, and even threatening to wipe out the human race. Amid the chaos and destruction, a young man named Riku leads humanity toward the tomorrow his heart believed in. One day, in the ruins of an Elf city, he meets Shuvi, a female exiled "Ex-machina" android who asks him to teach her what it means to have a human heart.
Near the ruins of an old and abandoned city, there is played a game simply known as "Otokoyo." It is said that when children play this game, they go missing one by one. Some say it is ghosts. Others say it is demons. But for Hikora, one thing is certain: his sister disappeared playing the game and he will do whatever it takes to find her, even if it means playing the game himself. He and seven others will do just that, all for their own reasons, and learn that rumors aren’t always fictitious. Escaping with their lives will become the main concern when this game of hide-and-seek turns deadly.
After proclaiming himself to be the illegitimate son of Prime Minister Iinuma, Akira is in hot water with not only the other Selecaos, but also Chiguse, the Prime Minister’s wife. With several Selecaos now out of the game and the identity of Mr. Outside still unknown, Akira, Saki and the members of Eden of the East must continue their quest to get to the bottom of things and build a better future for Japan.
Akatsuki Iride is a popular live streamer for the free-to-play game “The Ones Within-Genome”. But what was once fantasy quickly becomes his and 7 others’ reality when they’re transported to the game world against their will. View count matters more than ever before as millions watch them try to complete various high-risk challenges. Only the best will survive in this land that’s always live!
In the year 2808, criminals are no longer just wasting space in prison cells. The Cyber Police have turned to using these “patrons” by giving them a choice. Their sentence, or to work with them to catch other criminals and knock some years off their sentence. But getting off easy isn't, as each criminal is fitted with booby trapped collar that operates on a 24 hour cycle, stopped ONLY if they capture their intended targets. As time runs out on each case, someone's head must roll... the target's, or their own!