Super Smash Bros. for 3DS is out today, but challengers will need to grab an update before they can enter the internet arena. There are a couple of ways to access this update for the game we called "the most feature-complete, compelling Super Smash Bros. entry to date."
First, make sure the 3DS system is updated to the latest version. Then go to the Nintendo eShop on the 3DS and find Super Smash Bros. and select the update to download. When you start the game, it should show 1.0.2 on the title screen. Alternatively, you can grab the info from the QR code we've placed after the break.
Super Smash Bros 3DS update. Hit L + R to activate 3DS camera and tap button in lower left corner to access QR code reader: