Adventure Elsa is a Premium Box Tsum. She is currently only available on the Japanese version. She is a Limited Event Tsum and is not available from purchasing Premium Boxes outside of the event. She was first introduced during the Japan event Memories of the Four Seasons (December 2019). She is also a musical Tsum and will play the song, "Into the Unknown" during gameplay.
Adventure Elsa will clear surrounding Tsums when you tap the screen. The base radius is SS.
You can swipe the screen to move the crystals around before you tap.