Slowly Approaching Warp Speed ...
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You CANNOT Only Solve This Puzzle Once!
56:11
An Extraordinary New Sudoku Rule
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No Digits. No Clues. No Hope?!
17:01
The rarest move in chess
19:14
The strange cousin of the complex numbers -- the dual numbers.
22:04
The Genius Way Computers Multiply Big Numbers
2:45:04
"One Of The Best Puzzles I Ever Solved": WARNING: VERY Hard!
26:13