The Most Astonishing 4th Digit
![](https://i.ytimg.com/vi/WkrcLDNwyOE/mqdefault.jpg)
24:26
Erkenne den Beruf
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3:30:33
The Hardest Sudoku I've EVER Solved
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56:46
This Might Be The Puzzle Of The Year (and it's only February...)
![](https://i.ytimg.com/vi/BE5sxQCHUk0/mqdefault.jpg)
59:44
The Secret IN The Fog
![](https://i.ytimg.com/vi/xdtTT0Vx5bw/mqdefault.jpg)
49:24
This Constructor Literally Never Fails
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21:45
Why You Can't Bring Checkerboards to Math Exams
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1:10:29
Yin Yang Yong!! Who Else But Marty Sears :)
![](https://i.ytimg.com/vi/pQWFSj1CXeg/mqdefault.jpg)
20:19