Winding Key

Winding Keys are items required to play a stage in Island of Memories. A feature introduced in the 1.91 Update, Winding Keys refill one every set amount of minutes, holding a maximum of ten keys. They are otherwise obtainable through purchase with Crystals and sometimes rewarded for progress in the Island of Memories. Previously, they were also obtainable by watching ads, but this feature was silently taken out.