Online Free Medium Sudoku
What is Medium Sudoku?
Medium Sudoku is an intermediate difficulty level of the classic logic puzzle that sits between Easy and Hard. It’s designed for solvers who understand the basic rules but are ready to move beyond simple scanning and into logical deduction.
Tactics to solve medium web Sudoku game
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Pencil Marks
Write all possible numbers in empty cells. Essential—don't skip this.
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Hidden Singles
A number with only one spot in a row/column/box, even if the cell has other candidates. Most missed solve!
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Pairs & Triples
- Naked Pair: Two cells in same unit with same two candidates → remove those numbers from other cells in unit
- Hidden Pair: Two numbers that only appear in two cells in a unit → remove other candidates from those cells
Solve Faster sudoku online:
- Fill all pencil marks first
- Hunt hidden singles (check by number, 1 through 9)
- Scan each row/column/box for pairs
- Repeat after each placement
Ready for Hard?
When mediums take <15 min with few errors, and you spot pairs quickly.
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