Indoor soccer or arena soccer (known internationally as indoor football, fast football, or showball) is five-a-side version of minifootball, derived from association football and adapted to be played in walled hardcourt indoor arena. Indoor soccer, as it is most often known in the United States and Canada, was originally developed in these two countries as a way to play soccer during the winter months, when snow would make outdoor play difficult. In those countries, gymnasiums are adapted for indoor soccer play. In other countries the game is played in either indoor or outdoor arenas surrounded by walls, and is referred to by different names (such as "fast football" (futbol rapido) in Mexico, Futebol Society or showbol in Brazil, and "indoor football" (futbol indoor) in Spain).