The Puzzle That Defeated The World's Best Sudoku Players
41:24
A Christmas Present To The Sudoku World
18:16
Solving A Haunting Sudoku From The US
18:41
Diabolical Sudoku: One Of Our Best Solves?
29:23
Xmas with Cracking the Cryptic!
18:42
The impossible chessboard puzzle
26:13
Why don't Jigsaw Puzzles have the correct number of pieces?
32:44
The Simple Math Problem That Revolutionized Physics
12:21