Experiment 626 is a Premium Box Tsum. He was introduced during the Japan Event Stitch's Cousin Search (September 2018) and the International Event Stitch's Cousin Frenzy! (January 2019). On the Japan version only, he is also a voice Tsum.
626 will clear random lines of Tsums. His base number required is 21 and his base lines cleared is 3. Higher Skill levels reduce the number required.