As a rule, in informal games and tournaments players could mix and match different kinds, sizes and color buttons. Later on, the game became more strictly formalized, dispensing with variety for the sake of standardization. Today there are dozens of button football clubs throughout Brazil and Hungary, rigidly structured, with regular tournaments at the local, state, and national level. The majority of boys (and to a lesser extent girls) in both these countries play button football at some point in their youth.