Peak Sudoku

Peak Sudoku — a library of hand-graded Sudoku puzzles

Puzzle of the day

September 23, 2026

9
1
4
1
8
7
6
2
3
5
3
2
7
1
3
7
4
7
5
1
9
1
5
2
9
1
4
Medium(39/100)27 given cluesPlayed 74 times, and solved 21 times (28%) today.Play

Today’s puzzle can be solved using Naked Single, Hidden Single, Pointing Triple, Pointing Pair and Naked Quad.

Resume playing

Puzzles started but not finished will show up here once playing begins.

Daily puzzle by email.

Create a free account, and today's puzzle can arrive in your inbox each morning. You can also keep track of your stats and more.

Recently added puzzles

871 puzzles in the library, and counting.

1
7
9
2
8
1
7
3
5
5
3
2
8
9
1
7
2
8
7
3
9
2
2
5
1
6
9
1
4
5
9
8
9
4
7
1
2
6
5
1
Beginner(9/100)Play
4
5
8
9
6
3
1
2
8
9
1
8
4
2
7
9
7
4
3
8
9
5
6
2
1
6
2
3
7
8
4
5
1
3
5
1
6
2
4
7
8
9
Gentle(12/100)Play
8
4
6
2
6
3
8
2
5
6
3
8
2
8
4
1
7
9
5
1
7
2
8
6
7
4
8
2
5
5
7
6
8
3
3
4
5
4
8
6
1
Gentle(13/100)Play
2
3
8
9
5
6
7
6
4
4
6
9
8
6
4
3
5
8
7
3
6
1
9
4
3
8
5
9
4
8
1
4
8
7
8
9
3
1
4
6
Gentle(14/100)Play
3
1
8
9
7
1
4
4
3
6
5
3
4
6
2
7
8
9
8
1
8
9
1
8
6
4
Medium(39/100)Play
2
3
9
8
3
1
5
8
1
4
7
6
2
5
4
8
9
3
8
9
1
7
3
5
7
1
8
6
2
2
7
1
1
5
6
2
8
4
1
5
Easy(21/100)Play

Difficulty tiers

Beginner1–10

Perfect for a very first puzzle or a relaxing warmup, these grids can be solved through basic observation.

BrowsePlay random

Gentle11–20

This level introduces mild spatial deduction where numbers are restricted to specific lines, requiring the cross-referencing of intersecting rows and columns.

BrowsePlay random

Easy21–30

Here, pairs of numbers sharing two cells begin to appear, requiring their elimination from surrounding areas.

BrowsePlay random

Medium31–40

Spotting triplets is required: three numbers hiding within three specific cells, demanding a bit more active memory.

BrowsePlay random

Tricky41–50

This tier presents the challenge of finding groups of up to four numbers locked together in blocks or lines.

BrowsePlay random

Hard51–60

Welcome to the world of single-digit patterns like the famous X-Wing and Swordfish.

BrowsePlay random

Tough61–70

This category introduces "bent" patterns like XY-Wings and meta-logic tricks like Unique Rectangles.

BrowsePlay random

Expert71–80

Chains of strong and weak links must be traced across the grid to prove that two different scenarios cannot both be false.

BrowsePlay random

Extreme81–90

These puzzles demand mastery of Almost Locked Sets and complex chains that span multiple digits and intersection types.

BrowsePlay random

Diabolical91–100

Reserved for the most dedicated solvers, this tier relies heavily on branching logic and forcing chains where "what if" scenarios must be tested mentally.

BrowsePlay random
See the full difficulty guide →

About Peak Sudoku

Peak Sudoku is free to play, with no ads and no signup required. It features a massive library of high-quality puzzles, each validated by a real logic solver to guarantee it can be solved using specific, intended techniques. Every puzzle also carries a precise Peak Sudoku score from 0 to 100. This provides a consistent measure of actual difficulty, making it easier to find the perfect challenge without guessing what a label might mean.