Medium Alphabet Sudoku

Replace digits with letters A–I. Every row, column, and box must contain each letter exactly once. Free, no login required.

Easy Medium Hard Expert

Alphabet Sudoku at medium difficulty. Naked pairs and hidden singles are key — scan rows, columns, and boxes for letters that can only go in one place.

E
F
I
H
H
C
G
B
F
I
D
H
G
A
C
G
F
G
D
F
B
A
D
C
H
B
H
G
A
C
E
D
Mistakes
0/3
Score
-
Time
00:00
Try Hard Alphabet Sudoku →
Progress0%

What is Alphabet / Word Sudoku?

Difficulty
★★☆☆☆
2/5
Constraint Type
Letter Substitution
Typical Givens
24–32
Avg. Solve (Medium)
12 min

Solving Techniques for Medium Level

Technique Description Level
Same Logic, Different Symbols Every classic Sudoku technique applies — just with letters A–I instead of 1–9. Scanning, naked singles, and box interactions all work identically. Beginner
Letter-to-Number Mapping Internally, A=1, B=2, …, I=9. If numbers are more comfortable, mentally map each letter to its digit while solving. Beginner
Word Spotting Some Alphabet Sudoku puzzles are designed so a completed row or diagonal spells a recognisable word — identifying the target word can provide placement hints. Intermediate

Master these, then take on Hard Alphabet / Word Sudoku to learn Advanced techniques.

Techniques to Master at Medium

  • Hidden Singles technique — Letters carry no numeric order, which keeps hidden-single scans pure: you track presence and absence only, with no arithmetic instinct to distract you.
  • Notes in Sudoku — Pencil-marking matters more with letters — a cell noted "B E H" is harder to hold in your head than "2 5 8", so write marks down earlier than you would in classic Sudoku.

Average Solve Time by Difficulty

Easy
5 min
Medium
12 min
Hard
25 min
Expert
45 min
Want a full walkthrough of rules, strategies, and solving steps? How to Play Alphabet / Word Sudoku →

Related Variants

Mini Sudoku (4×4)

The other easy-entry variant — identical logic to classic Sudoku shrunk to a 4×4 grid you can finish in minutes.

Odd / Even Sudoku

Reintroduces number properties gently: shaded cells tell you the parity of the digit inside.

Consecutive Sudoku

A first step into relationship clues — bars mark neighbouring cells whose values differ by exactly 1.

Frequently Asked Questions — Medium Alphabet Sudoku

What strategies work best for medium Alphabet Sudoku?
At medium difficulty, use naked pairs and hidden singles. A naked pair is two cells in the same unit that share exactly the same two candidate letters — you can eliminate those letters from all other cells in that unit. Hidden singles occur when a letter can only go in one cell within a row, column, or box.
How do I keep track of candidates in Alphabet Sudoku?
Use the notes feature to pencil in all possible letters for each empty cell. As you place letters on the board, remove them from the candidate notes of cells in the same row, column, and box. This makes hidden singles and pairs much easier to spot.
Why is medium Alphabet Sudoku harder than easy?
Medium puzzles have fewer given letters and require two or more logical steps to unlock each placement. You can't rely on single-cell eliminations alone — you must cross-reference multiple units simultaneously to find where each letter is forced.
What is a hidden single in Alphabet Sudoku?
A hidden single is a cell that is the only place within a row, column, or box where a specific letter can appear. Even if the cell seems to have multiple candidate letters, the hidden single forces a particular letter there because no other cell in that unit can hold it.
How long should a medium Alphabet Sudoku take?
Most players complete a medium Alphabet Sudoku in 10–20 minutes. If you're newer to the letter format, allow a few extra minutes until you're comfortable scanning letters as quickly as digits.

More questions? See the full Alphabet Sudoku guide.