For those who have never heard of it, this is a fighting game series. You play as well-known video game characters as you try to knock opponents off the screen. All three games are well worth playing at least once.
More info: http://en.wikipedia.org/wiki/Super_Smash_Bros._%28series%29
More info: http://en.wikipedia.org/wiki/Super_Smash_Bros._%28series%29