Here is an interesting puzzle that I found:
You have three 10's. It looks like this:
| 0 | 0 | 0
Add one stroke to the diagram to create 950.
$\begingroup$
$\endgroup$
$\begingroup$
$\endgroup$
The stroke to add is
at the top of the second |, turning it into a T. The message then spells "10 TO 10", or 9:50 (10 minutes until 10:00).
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$\begingroup$ That is correct! That's actually what I found. :D $\endgroup$ – fasterthanlight Aug 17 '20 at 13:26
