Trace all the dots using four straight lines and without lifting your finger.
Move only three coins and turn the triangle upside down.
The large circle’s diameter is 84 units. What is the area of the red shaded region?
http://mrhonner.com/archives/1621
KenKen: Your goal is to fill the whole grid with numbers, making sure no number is repeated in any row or column.
In this puzzle each row & column contains the numbers 1-4.
https://solveme.edc.org/Mobiles.html