KH3 Sora is a Premium Box Tsum. He is a limited event Tsum and is not available from purchasing Premium Boxes outside of the event. On the Japan version only, he is also a voice Tsum.
Sora KH3ver. will clear horizontal and diagonal line plus the center of Tsums. His base number required is 28 and his base radius is SS. Higher Skill levels reduce the number required.