Foggy Outside

Today's Puzzle:

Another incredible puzzle from Flinty, this time with Fog in it, one of the regulars most favoured variant. Enjoy!

Link to Play Along:

Foggy Outside by Flinty https://tinyurl.com/SudokuSleuthFoggyOutside

Rules:

Standard Sudoku Rules Apply.

Quadruples - Digits in a circle must appear in that 2x2.

Sandwich Sums - Numbers on the outside give the sum of the digits between 1 and 9 in that column or row.

Thermometers - Digits increase from the bulb.

Arrows - Digits along arrows sum to the digit in the circle.

Black Dot / Kropki - 2:1 Ratio White Dot / Kropki - Consecutive Digits No negative constraint.