March of the Quads: In Point of Fact
49:38
March of the Quads: Lizard Tongues
41:02
A Sudoku With ONLY 3 Given Digits?!
26:05
Sudoku Circles Double Up
1:02:01
No Digits. No Clues. No Hope?!
21:05
Why is there no equation for the perimeter of an ellipse‽
31:37
Mathematicians finally find the infinite card game.
32:06
Sliced Sudoku Puzzle Pack : Sandwiches and Sides by EPH
19:52