Earlier this month, girl band f(x) was chosen to sing the OST for online game Puzzle Bubble. Although Taito, Japan originally developed the game in 1994, it has only recently been introduced to South Korea. Today, f(x) released the OST to help promote the game to new fans. The song itself is light, fun, and quirky. Their energetic delivery and the cheerful melody make it perfect for playing an online game. The full audio is available now, so check it out below. Tip: Jen