 Even with the inclusion of Ozite characters, and even though it is, in the judgment of some critics, "far superior" to its predecessor, "Sky Island" sold even fewer copies in its first year than "The Sea Fairies" had; 11,750 copies of "Sky Island" were sold in 1912.Baum attempted to launch two other juvenile novel series in the same 1911–12 period, "The Flying Girl" and "The Daring Twins", neither of which was a long-term success.Disappointing sales inspired Baum and Reilly & Britton to view a return to Oz as an obvious and necessary step, leading to the publication of "The Patchwork Girl of Oz" and the "Little Wizard Stories of Oz" the next year, 1913.