Hello and welcome to walleyball.org!
Greetings! This work in progress is here to help people learn about my favorite sport (walleyball) and find places to play it. So, without further ado:
Wallyball "is a fast-paced sport that is similar to volleyball played in a racquetball court" (from https://en.wikipedia.org/wiki/Wallyball.
There is an 'official' walleyball organization, the American Walleyball Association.
For a bit of history on WB, check out the RulesOfSport web site, which also mentions the actual creator of WB - Bill Dejonghe. However, Joe Garcia was the one who popularized the game and is sometimes credited with its creation.
For some videos of WB use your favorite search engine, or look for the Walleyball videos on https://duckduckgo.com/?t=lm&q=walleyball&atb=v302-1&iax=videos&ia=videos