Sudoku 9 by 9: two tricky puzzles: sudoku puzzle for Grades 11–12, page 1 preview

Sudoku puzzle · Logic & Puzzles

Sudoku 9 by 9: two tricky puzzles · Grades 11–12

Fill two 9 by 9 sudokus so every row, column and 3-by-3 box has 1 to 9 exactly once. About 25 clues each; these need sharp deduction, and each has exactly one solution.

Grades 11–12 · ages 16 to 18
Hard
20 to 30 minutes
1 page
Free

The answer key is a separate page for grown-ups. Sign in to download it.

Make another one like this

What the sheet says

Directions: Fill in the empty squares so every row, every column and every thick-lined box has the numbers 1 to 9 exactly once.

1 25 clues
2 25 clues

What your child practices

Your child practices logic and puzzles for Grades 11–12 with this sudoku puzzle.

Grades and ages: Grades 11–12, ages 16 to 18
Time: About 20 to 30 minutes
Subject: Logic & Puzzles
Level: Hard for Grades 11–12
Answer key: Yes, for grown-ups who sign in
Printing: 1 page, US Letter or A4, low-ink option
Updated: October 15, 2026

How to use it

Read every clue or rule before filling anything in. Use a pencil so changes are easy to make. It is one of the harder sheets for Grades 11–12, best once the basics of the topic are secure.

An answer key comes with it as a separate page that grown-ups download after signing in.

Tip for grown-ups: Start with the row, column or box that has the most numbers already filled in.

Done on paper? A grown-up can record it on the child's page in PlayOwl; downloading alone doesn't count as finished.