Daily Kropki Sudoku
The extra rule
A white dot joins consecutive digits. A black dot joins a digit and its double.
Every dot is shown. That is the part that makes this work: a bare edge between two cells is a clue as well, because it tells you those digits are neither consecutive nor double one another.
Where both could apply, as with 1 and 2, the dot is black.
Because the dots carry so much, these grids start with almost no digits at all. Some start with none.
Controls
Click a cell and type a digit, or use the pad. Space toggles pencil marks. Arrow keys move. Progress saves in this browser as you go, so you can come back to the same puzzle later today.
Solvable Without Guessing
Every puzzle here was generated and then handed to a solver that is only allowed techniques a person can use. If it could not finish the grid without a guess, the puzzle was thrown away rather than published. That also makes the answer unique, because every digit it placed was forced.
More to Play
There is also a xv sudoku, a greater than sudoku, a even odd sudoku, a nonogram with hand drawn pictures, and 2048. All of them are on the games page, and the solvers for real objects are on the puzzle tools page.