Super Star Smashers/Wi-fi

Wi-Fi connection allows you to fight online with people around the world. When you are about to begin, you are taken to an online waiting room where you beat the crap out of The Cheat.

When everyone's ready, you can brawl it out.

You can also do spectator mode and bet coins and stickers on a CPU battle.

Another feature that SSBB lacks, downloadable characters! There's only five, but you have the chance to unlock five more unique characters.

Look up downloadable characters in the Unlockables section.