Rainbow Stars are a currency in Plants vs. Zombies: Garden Warfare 2 that were introduced in the Trials of Gnomus DLC. They are a variant of Stars, and they are used to open chests inside the Town Hall. The chest on the left costs 10 Rainbows Stars to open, the chest on the right costs 30 Rainbow Stars to open and the middle chest costs 50 Rainbow Stars to open. The player can hold up to 50 Rainbow Stars at a time.
Rainbow Stars can currently only be obtained in two ways. The first and main way to earn Rainbow Stars is to enter the Mystery Portal inside the Town Hall and complete events inside it and will give the player between 3 and 7 Rainbow Stars. The second way is to give 7 stars to the seagull inside the Town Hall, in exchange for 1 Rainbow Star.
- If the player obtains 25 Rainbow Stars by completing events inside the Mystery Portal, they will earn the Somewhere Over the Rainbow achievement.