
Multiples Ping Pong
In a 3×3 grid, digits are added to make numbers horizontally and vertically. Each time a digit is added, it must create numbers that are either not a multiple of three or a multiple of three alternatively. The same digit…

Consecutives with Common Multiples
Using 1 to 6 as digits exactly once, can we make multiples of 1, 2, 3 and 4. What if we were able to share common multiples across numbers? What would be the greatest number possible? What would be the…