★ Free & printable
🔠
Ocean Submarine Letter Sudoku
Free printable marine-themed Wordoku with the 9 letters of SUBMARINE. Play online or download PDF worksheets for classroom or seniors.
Word:
Level:
Letter Sudoku (Wordoku)
Fill with S · U · B · M · A · R · I · N · E. The shaded diagonal spells a secret 9-letter word!
🔍 Secret Diagonal Word9 Letters
_
_
B
M
_
R
I
_
_
💡 Clue: “Vessel that travels deep underwater”
Input Letter (Available 9 Letters)
How to play Wordoku:
- Fill the 9×9 grid using only the 9 letters of “SUBMARINE”.
- Every row, column, and 3×3 box must contain each letter once.
- The shaded main diagonal spells out the secret 9-letter word!
🧩 Sudoku Family
Explore the The Sudoku Family & Grid Variations
Explore the full range of Sudoku variations — from classic 9×9 grids to diagonal constraints, cage sums, irregular polyominoes, and word-based puzzles.
Part of the 7-tool suite
🔠Current
Wordoku (Letter Sudoku)
9 letters spell a secret hidden anagram word along the diagonal
Currently using this generator
📖Solving Guide & Rules
Learn How to Play, Solve & Teach Ocean Submarine Letter Sudoku
6 min read
Wordoku & Letter Sudoku: Rules, Solving Strategies & Mystery Word Puzzles
Learn how to solve Wordoku (Letter Sudoku), the popular word puzzle variation of classic 9×9 Sudoku where 9 letters reveal a secret hidden anagram along the main diagonal.
Read full guide & tactics→Printable & Free