Logic Masters Deutschland e.V.

A very approachable introduction to loop sudoku.

Puzzle link: Solve in SudokuPad



Normal sudoku rules apply.
Loop construction: create a 1-cell wide line of orthogonally adjacent cells which connects at both ends(make a loop). Digits along it alternate parity(odd-even).
Cells with an arrow are part of the loop and the digit in it counts all the cells that are part of the loop in the indicated direction including the cell itself. The line cannot touch itself neither orthogonally nor diagonally, and must avoid all cells that have kropki dot in it.
Kropki dots:
White dots separate consecutive digits
Black dots separate digits in 1:2 ratio(1 digit is double the other)