Opt-in for the free spins.
Claim 15 FS on Starburst, Gonzo's Quest, Berryburst, Pyramid: Quest for Immortality and Finn and the Swirly Spin after playing £30 on Mystical Tarrot, Red Carpet, Peking Fantasy, Wild-a-go-go, Rag Time Riches, Dragon's Wild, or African Diamond.
Best of luck!