If you register both Super Smash Bros. for Wii U and Super Smash Bros. for Nintendo 3DS with Club Nintendo before 22:59 (UK time) on January 20th 2015, you can claim two special rewards: an exclusive CD, and the additional character Mewtwo!
The Super Smash Bros. for Nintendo 3DS & Wii U: Premium Sound Selection double CD set is packed with a whopping 72 songs taken from the handheld and home console versions. This aural extravaganza is only available through this promotion, and only to participants who qualify before 22:59 (UK time) on January 20th 2015.
Promotion participants who qualify between 23:00 (UK time) on January 20th and 22:59 (UK time) on March 31st 2015 will be able to add the powerful character Mewtwo to their game by claiming two free download codes – one for Wii U, one for Nintendo 3DS. The free download codes for Mewtwo will be distributed in spring 2015. The character will be made available to purchase as add-on content in the future.