Sophie Maclean explains Animal Tic-Tac-Toe - and why the Snakey hexomino is the only "unsolved" creature. More links & stuff in full description below ↓↓↓ Sophie's previous polyominoes video: https://youtu.be/ONdgXYEBihA More Sophie on Numberphile: https://bit.ly/Sophie_Numberphile Sophie Maclean ...