Daily Jigsaw Sudoku
The extra rule
The nine regions are irregular shapes, not 3x3 boxes.
Rows and columns work exactly as always. The boxes are gone, replaced by nine connected regions of nine cells each, outlined in heavy lines.
The region shapes change every day. Without the comfortable 3x3 grid, the usual scanning habits stop working and you have to read the shapes instead.
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.