For more details on purchasing add-on content, see here.
* Mewtwo is available as add-on content. Participants in the Super Smash Bros. Club Nintendo Promotion can use their download codes to download Mewtwo from April 15th 2015. Mewtwo will be available to purchase from April 29th 2015. For more details, please view the "Add-on Content Smashes In!" page.

Warning! Spoilers Inside!
The following webpage has details on hidden parts of the game. Do you wish to continue?