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The main force behind it is the Bakugan Battle Brawlers game, which consists of little boy hand sized plastic balls (called Bakugan if you can believe it) which pop open to transform into small fighting creatures when they roll onto special spots on the Bakugan Cards.  There is a magnetic clasp inside each ball that allows it to pop open into it’s creature form when it’s placed on a metal surface (such as hidden inside the Bakugan Cards).

In a game each player lays their cards out in turns with the rule that they must have one full edge touching another card (think Dominos).  Then the players take turns shooting their Bakugan onto the cards (think Marbles).  When one Bakugan from each player stands open on a card, they “do battle” by comparing the “G Power” values shown on each Bakugan adjusted by different values listed on the back of the card for each different possible color Bakugan. (think Pokemon).  The winner of the battle takes the card and both Bakugan and play continues until there are no more cards.