[+ +] (read as "plus plus") is the debut extended play (EP) by South Korean girl group Loona. It was released on August 20, 2018, by Blockberry Creative and distributed by Danal Entertainment. The EP supported with the lead single, "Favorite" and the title track, "Hi High" the same day as the EP released.

The EP was the second highest selling debut album by a girl group in 2018 with 52,823 physical copies sold. It has sold over 107,248 physical copies combined as of May 2020.

A repackaged version, [X X] (stylized as [× ×]; read as multiple multiple) was released on February 19, 2019, by Blockberry Creative and distributed by Kakao M.

Name	Status	Rating	Review
luca
jay
chairs