A delightful boxing experience, Super Punch Out is a fine example of the boxing genre. Sporting lovely graphics and fine playability, Super Punch Out is, after two decades, still one of the best examples out there. Each opponent comes with their own set moves, which must be mastered before progressing. Even after learning your opponents moves, co-ordinating your reactions to actually dodge them in the heat of a fight is where the skill lies. After the game is completed, one is still prone to lose to any of the better opponents if not enough concentration is applied. 
Three tiers are available to work through, the Minor, Major and World divisions. Three opponents and the Champion await you. The game lacks some depth insomuch as there is not a Career Mode to speak of, which would've added some more layers to the game. However, it certainly doesn't stop ones enjoyment. The game excels in its use of viewpoint, which is where other games struggle, in my opinion.
As a side note, the use of the counter punch, although sometimes difficult, is where the speed knock outs are achieved. I have knocked out many opponents inside thirty seconds or less (Gabby Jay is possible to KO in 9 seconds), and I believe there is a way to complete the game beating every opponent inside thirty seconds, using the counter punch and power punches.
Overall, one of my favourite snes games, and a more satisfying boxing experience will not be found elsewhere.