Daily Little Killer Sudoku
The extra rule
A sum outside the grid is the total of the digits along the diagonal its arrow points down.
Each clue sits outside the grid with an arrow. Add up every digit the arrow passes through on its way across and you get the number printed.
A diagonal is not a region, so digits may repeat along it. That is what makes these different from a killer cage, where every digit in the cage is different.
Short diagonals near the corners are the ones to start on. A two cell diagonal summing to 17 can only be 8 and 9, and a three cell diagonal summing to 6 has almost nowhere to hide.
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 kropki sudoku, a xv sudoku, a greater than 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.