Its deluxe version was released in the United States on June 19, 2012.

Wonder Party is the last mini-album by the Wonder Girls to feature members Sunye and Sohee before their departures from the group in December 2013 and 2014.

[1][2] In South Korea, Wonder Party was digitally released on June 3, 2012, which was also the fourth anniversary of the group's second mini album So Hot.

A physical edition of the album was released three days later.

On June 19, 2012, a deluxe edition of the album was released in the United States.