March of the Quads: Entomology
25:47
March of the Quads: Spring in the Step
38:49
One of the Nine Set Out, searching for the One Sudoku Ring.
32:29
March of the Quads: Spin Cycle
18:46
March of the Quads: Quads Ahoy!
2:45:04
"One Of The Best Puzzles I Ever Solved": WARNING: VERY Hard!
50:23
Skimming the Sudoku Event Horizon, lost for years.
16:44
3 Sudoku Concepts Every Solver Needs To Know
24:20