"Hot Game" (핫게임 Hat Geim; ホットゲーム Hotto Gēmu) is a song by South Korean boy band A-Jax. It was released on July 11, 2012 as the group's second single. In August 9, Universal Sigma announced that the song was re-recorded in Japanese and would be released as the group's second Japanese single, on October 31, 2012.

After the promotions of the single "One 4 U", DSP Media, group's label, started an event called "Wing Car Project", to the group meet their fans outside Seoul. A special truck was used to the group travel for the cities. The cities stated are Daegu on July 7, Busan on July 8 and Daejeon on July 9. In that same statement, it was also announced that the group will be releasing a new digital single in July. One day later, it was revealed a photo of the truck's back, revealing the name of the new single, titled "Hot Game". The song was first performed in Daegu's event. DSP Media also informed that the song will be promoted as "One 4 U" follow-up song.

In August 9, Universal Sigma and DSP Media announced that a Japanese re-recorded version of the song will serve as the group's second single. In September 28, Sigma updated the news with more details of the single, jacket covers and track listing. The single will be released in four editions: a CD+DVD, including the CD single and a DVD including the song's music video and a special off-shot video, a CD+Photobook edition, including the CD and a special photobook and two Regular editions: first press, with a cover of the song "A Song Calling Your Name", originally sung by SS501, as bonus track and a normal edition, including only the CD single with the normal track list.

The song was written by Kim Ji-hyang, also known for writing songs for the groups U-KISS, Girl's Day, for the artist Lee Hyori and more. It was composed by Steven Lee, same composed of the songs "One 4 U" and "Never Let Go", released by the group.

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