colors In addition to being available in the four standard Wii Remote colors, specially colored Wii Remote Plus controllers themed after Nintendo's first-party video game franchises were also released in the years that followed, with one golden Legend of Zelda Wii Remote Plus and several others based on Mario characters. A red Wii Remote Plus, initially designed to celebrate the Mario series' 25th anniversary, was included in red Wii bundles released for the occasion along with a matching Nunchuk and console, Wii Sports and New Super Mario Bros. Wii. The red Wii Remote Plus would also be bundled with European copies of Wii Play: Motion, which is replaced with a black one in other regions. A red Wii Remote Plus and Nunchuk of matching color is also included with every Wii Mini. At E3 2011, it was revealed that a gold Wii Remote Plus with the Hylian Crest superimposed over its speaker would be released alongside The Legend of Zelda: Skyward Sword. It was available as part of a bundle with Skyward Sword for a limited time. A matching gold Nunchuk was also available to earn for Club Nintendo members for a limited time. In 2012, the Wii Remote Plus was reissued, and branded for the Wii U, the Wii's successor. Another sync button on the battery cover was added, allowing users to sync without removing the battery cover. A year later, Nintendo began releasing Wii Remote Plus controllers that are themed after Mario characters, starting with Mario and Luigi on November 1, 2013, to accompany the release of the Wii U Deluxe set. A few months later, Nintendo released a Princess Peach-themed Wii Remote Plus, on April 24, 2014. A year later, Nintendo also released Wii Remote Plus controllers themed after Bowser, a Toad and Yoshi in the fall of 2015 to accompany the releases of Super Mario Maker and Yoshi's Woolly World, exclusively available at GameStop. Expansions The Wii Remote has an expansion port at the bottom which allows various functional attachments to be added. The connector, and any accessories that attach to it, use a 400 kHz I²C protocol. This expandability is similar to that available with the port on the Nintendo 64 controller. There is a female connector on Wii remotes, to which expansions with a male connector can be connected. The multiple kinds of controllers that can connect to the Wii Remote make it into