More Numbers in the Ring
With 3 squares, not possible to make odd difference as need
alternate odd/even around circle.
Can make even difference by all odd numbers or all even
numbers.
When there are an odd number of squares in the ring, making an odd
difference is impossible.
When there are an even number of squares in the ring, making an
odd difference is possible by having alternate odd/even numbers
round ring.
The sum of adjacent squares is always odd.
It is always possible to make an even difference as long as the
numbers are all odd or all even.
The sum of adjacent pairs is always even.