Hard 6×6 number sudoku puzzles

What is on this worksheet

A 6×6 sudoku with the fewest squares given, which takes real logic to complete.

• Grid size: 6×6
• Symbols: Numbers
• Squares given: Fewest squares given

You can change any of these settings above. Press "New problems" for a fresh set with the same settings, or pick Version A to Z to print different sheets for neighboring desks. The answer key always matches.

About sudoku puzzles

Students fill a small grid so that every row, column and box holds each symbol exactly once. The 3×3 and 4×4 grids can use simple shapes (circle, square, triangle and plus sign) that children can draw, which makes them a first logic puzzle for kindergarten and first grade. Numbers on 4×4 and 6×6 grids suit older students.

Every puzzle has exactly one solution. Choose most squares given for a gentle start, or the fewest squares for a real challenge.

Printing

US Letter or A4, portrait: choose your paper size above. Print at 100 percent (actual size). Use "Black and white" for the copier, or "Color" for display pages and mini books.