Midnight snack

Normal 4x4 sudoku rules apply. Place the digits 1 through 4 in each empty cell. Digits must not repeat within the same row, column, or box.

Renban: Digits along each renban line must be a set of consecutive digits in any order, and must not repeat.

Kropki dots: A black dot between cells indicates cell values with a 2:1 ratio. Not all dots are shown.