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The Easiest Cryptography Game
12:17
The Problem Newton Got Wrong
13:51
The 100 Prisoners Puzzle
11:49
The Secret of Snakes and Ladders
7:07
How Many Sides Does A Circle Have?
6:14
Double Sixes Death Game
8:23
You'll Never Win This Game
26:51
New divisibility rule! (30,000 of them)
16:07
Terrific Toothpick Patterns - Numberphile