Peak Sudoku

Peak Sudoku — a library of hand-graded Sudoku puzzles

Puzzle of the day

October 22, 2026

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Easy(24/100)27 given cluesPlayed 100 times, and solved 33 times (33%) today.Play

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

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Recently added puzzles

451,969 puzzles in the library, and counting.

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Extreme(86/100)Play
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Hard(55/100)Play
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Extreme(87/100)Play
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Extreme(81/100)Play
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Hard(57/100)Play
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Tough(69/100)Play

Difficulty tiers

Beginner1–10

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

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Gentle11–20

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

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Easy21–30

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

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Medium31–40

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

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Tricky41–50

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

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Hard51–60

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

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Tough61–70

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

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Expert71–80

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

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Extreme81–90

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

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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.

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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.