**Sudoku** puzzles require you
complete a grid of numbers by placing digits
in available cells so that each
digit appears only once in each row, column, and
boxed area. In small Sudoku, the digits 1-4 are used to fill a 4x4 grid,
and in regular Sudoku the digits 1-9 are used to fill a 9x9 grid.

On this page, blank white cells are available - your goal is to fill in each blank with a valid digit. The grey cells are the fixed initial values of the grid and cannot be changed.

In the board below, if **hints** are turned on, then all cells that only
have one possible value are highlighted in **green**, while cells that have
conflicting
values are highlighted in **red**. Note that the hints are updated based on the
fixed values and the values that you have entered, not on the actual solution.

You can download a printable version of the regular size puzzles by clicking on the
**Open in Overleaf** button. This will open the puzzle as a LaTeX file that
can be downloaded as a PDF.