Wild Prizefighters is an animal boxing card game invented by J. Ryan Opp that he is currently pitching to publishers. It is primarily a two-player experience, but also has a solo mode and a league mode in which you can play with any number of players if you have enough copies of the game.
This has now been made into a digital experience on this very webpage. Also, there is a dedicated solo mode that saves high scores and will be faster if you're just playing solo. As a web game, these are very much still prototypes, so you do Ryan a service by playing them through and beating your friends (multiplayer) or getting your scores on the high score list (solo). If you have any questions or comments, join the facebook group and we'll talk about them there.