The one extra that will enhance your game the most of the music. Brawl has an absolutely gargantuan soundtrack, consisting of nearly 300 legitimate songs; the OST is over 16 hours long, apparently. And this is no matter of quantity over quality; almost every one of these nearly 300 tracks is a winner, boasting superb arranging and some throwbacks to older games that will probably make you giddy. The soundtrack quality is nothing short of superb, and on the Wii it is unrivaled.
Overall, Super Smash Bros. Brawl hands you a wildly entertaining core package, and then stuffs it so full of extras that you’re going to have all sorts of trouble putting this game down anytime over the next few months, and you won’t stop playing it for years. Brawl gets an automatic Yay! from NintendoGal, and a recommendation to go out and buy it the first chance you get. This is the new standard.