3

5 3 x  x 7 x  x x x
6 x x  1 9 5  x x x
x 9 8  x x x  x 6 x

8 x x  x 6 x  x x 3
4 x x  8 x 3  x x 1
7 x x  x 2 x  x x 6

x 6 x  x x x  2 8 x
x x x  4 1 9  x x 5
x x x  x 8 x  x 7 9

This is solvable with naked singles only.

"A very easy Sudoku puzzle with a nice layout. It can be solved with the most elementary tactics."

From <https://en.wikipedia.org/wiki/Sudoku_solving_algorithms>.
File:Sudoku Puzzle by L2G-20050714 standardized layout.svg
Tim Stellmach.
2017-04-08.
This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
5 3 4 ║ 6 7 8 ║ 9 1 2 
6 7 2 ║ 1 9 5 ║ 3 4 8 
1 9 8 ║ 3 4 2 ║ 5 6 7 
══════╬═══════╬══════
8 5 9 ║ 7 6 1 ║ 4 2 3 
4 2 6 ║ 8 5 3 ║ 7 9 1 
7 1 3 ║ 9 2 4 ║ 8 5 6 
══════╬═══════╬══════
9 6 1 ║ 5 3 7 ║ 2 8 4 
2 8 7 ║ 4 1 9 ║ 6 3 5 
3 4 5 ║ 2 8 6 ║ 1 7 9