Rookie girl group sensation, MAMAMOO, has just released a new single, "Girl Crush," for a soon-to-be-released online game.

The funky retro-pop track was created specifically for the soundtrack for online and mobile game development and marketing company, Entermate's, newest online game, "Innisia Nest." In addition to creating a track specifically for the "Innisia Nest" soundtrack, the lovely ladies of MAMAMOO have signed on as models for the upcoming game.

"Girl Crush" was written and composed by Park Woo Sang, who also worked with MAMAMOO on their single, "Love Lane," which was released earlier this year as part of tvN's drama, "Marriage, Not Dating" OST.

Debuting in June 2014 with their first EP, "Hello" the four-member group was well-received as the album's title track, "Mr. Ambiguous," reached number 19 on Korea's Gaon Music Chart and 28 on Billboard Korea. Their sophomore project, "Piano Man," also met with success as the EP as a whole ranked 8th on Korea's music charts.

Their latest single, "Um Oh Ah Yeah," which was released in June of this year, topped out at number 3 on Korea's Gaon music chart while the mini-album, "Pink Funky," topped out at number 6 on Korea's charts and 7th on Billboard's World Chart.