While Bill Gates doesn't play very many video games, the Microsoft co-founder does have a soft spot for one specific Xbox Live Arcade title: Zuma

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In this month's episode of IGN Unfiltered , XBLA creator Greg Canessa discussed Gates' involvement in Xbox Live Arcade, noting he was "personally interested" in the service because it was expanding the console's software portfolio and bringing with it new casual games."He personally was a casual gamer," Canessa explained. "He loved Zuma in particular. And so he wanted to actually give feedback on the experience. His kids were little at the time and so he said: 'This is actually something for the first time that I can play with my kids at home on the weekend.'"Interestingly enough, Gates was so invested in Zuma, that he's credited for the creation of one of its modes. "He is actually the guy who came up with the colorblind mode—because he's colorblind—that we actually ended up implementing in all of the PopCap games and most of the XBLA games that were color dependent," Canessa added.Which Xbox Live Arcade title is your favorite? Let us know in the comments, and for more on our conversation with Canessa, here's the story on how XBLA almost didn't happen

Alex Osborn is a freelance writer for IGN. You can follow him on Twitter and subscribe to him on YouTube