A while back, before Super Smash Bros. for Wii U was released, Nintendo announced that they will treating customers who purchase both the 3DS and Wii U versions of Smash with a special soundtrack and Mewtwo DLC pack. All you need to do is to link both versions to your Club Nintendo account before the deadline and you are eligible for the promotion.
However, those of you who have purchased/will purchase the game digitally, there is a slight risk involved. According to a Nintendo Customer Service Representative, you have to register the game within five days of purchase if you are getting digital copies, you also have to link your consoles to Club Nintendo prior to registering the game. If you fail to meet these requirements, then you are unable to participate in the promotion, meaning you will not reap the glorious Smash Bros. for Wii U/3DS soundtrack or the free Mewtwo DLC Pack… BOO!!!
Check out Nintendo’s full statement after the break!