Double The Fun

It’s a very special day for Nala because she gets a visitor. It is her best friend Nelly! Nala and Nelly have been best friends since their earliest puppy weeks. Whenever they come together all the fun is doubled, but the backyard will be left in chaos and a huge cloud of dust.

How will the backyard look like once the dust settled?

Normal Sudoku rules apply: Place the digits 1-9 in every row, column and box exactly once each.

Each of the digits 1-9 appears as a „Doubler“ exactly once in the grid. There is only one „Doubler“ in each row, column and 3x3 box. Digits that appear as „Doubler“ have a value that is double their size.

The value of digits in a dashed cage must sum to the total in the top left corner of the cage. Digits may not repeat within their own cage, although values may.

The value of digits along an arrow must sum to the value of the digit in the corresponding circle. Each arrow has its own color. Arrows of the same color are connected.

Additionally the grid is partially covered in fog. Placing correct digits will clear the fog from surrounding cells, possibly revealing more clues.