In the Dark

It’s just a straightforward Killer Sudoku puzzle, right? Except you can’t see it all at once. You can see just enough to fill in one cell, after which you’ll be able to see more.

This is the first of four puzzles exploring a guided solve path using Fog of War.

Rules:
Normal Sudoku rules apply.
In cages marked with a dashed line, digits sum to the small number in the top left corner of that cage.
Correct digits reveal the cells surrounding them, up to eight.

Estimated difficulty: 1 out of 5