Boxing.free is a Windows Store and a Windows Phone game where you are boxing vs a computer player which player gets harder to beat during the game.
There is a help menu with the movements you will be able to do during the fights.
Sometime you can knock down the other player or even knocked down but you have to fight until one of the players is knocked out.
Be technical and calm like the legends- Mohamed Ali, Mike Tyson, Floyd Mayweather and Wladimir Klitschko
or aggressive, powerful and inexhaustible like the new stars- Anthony Joshua, Deontay Wilder.