Cells that are a chess knight's move apart must not contain the same number.
Numbers that appear in the cells between a difference constraint must have a difference of 1.
Numbers that appear in the cells between a ratio constraint must have a ratio of 2.
Not all dots are given.
Cells with grey circles must contain odd numbers.
Cells with grey squares must contain even numbers.
F-puzzles link - link to solve online
Lösungscode: Row 4 followed by Column 2