I guess one would use the Fly Pentop Computer (sold separately) to play the game. It isn't clear to me looking at a card how one would do that. Here's what one of the cards looks like, courtesy of COMC.com.
|2005 Upper Deck Flyball #40 - Mark Prior
Included in the starter box are 28 Interactive Upper Deck Player Cards. There are 210 cards in the set. My digital edition of the Standard Catalog of Baseball Cards (ca. 2009) doesn't have a listing for them.
The box was $3.99. I walked around with it for a few minutes and put it back on the shelf. Not that it isn't a good deal. I'm sure it is. I just don't need more cards in my house that don't fit in with my collecting scheme. Maybe I'll go back, buy it, and donate the cards to the Pack-A-Daily-Circus fiasco.
By the way, I didn't have any cavities.