Similar to the Flashback series, this challenge is restricted to garments from the previous season and year, with a key difference: upon completing the Retro Challenge Series, participants can earn an old Hair Accessory Pack.

If you already own the HA pack, you'll receive 500 Diamonds instead.

For each event completed, you will also receive a milestone rewards. Achieving a score over 4.2 as an average in the entire series will receive a bonus reward.