Probably my favourite boxing game and one of my favourite games of all time, it's so good, everything from the movement of the characters and how they move and react to certain actions and punches, the AI actually learns about you during the fight and tries to adapt a different kind of way of fighting, and the best part about the game is without a doubt, the career mode, in this game called Boxer's Road.
Boxer's Road is simply creating your own boxer, putting him into the timeline of Hajime No Ippo, and trying to achieve glory by winning championships and maybe trying to win the infamous featherweight title against the one and only Ricardo Martinez, the hardest and probably the most unforgiving character of all time in any boxing videogame. The game is very detailed in a way that, in order to create a boxer that actually can put up a fight, you need actual knowledge of diets and training and with that knowledge you need to create MEALS and a TRAINING SCHEDULE based on what type of boxer you want to have, for example, if you want you can make the fastest boxer alive by selecting a exercise that alter Hand Speed and Footwork (i highly recommend reading a guide or watching a video while playing, for example, go on RedSwan channel on YouTube he has everything you need.) Fail to do so and your character would simply not compete with others getting destroyed miserably. So yes this is a very complicated and challenging game for its time, i definitely recommend giving it a go because simply is a one of a kind game.