Simple solver by Robert Gustafson
Paste a Sudoku table below, and press solve to find a solution. Use numbers 0-3 for a 3x3 sized table. 0 represents an unknown space.
Then press solve
Now change the values and try again!

Different rows of the puzzle are split by newlines.
Valid inputs are 0-3.
Spaces are not valid imputs.
All rows must be the same length.

Example puzzle:
300
210
000