2026-06-14
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Puzzle guide
Full breakdown using the Case file format — cell-by-cell fills, technique labels, and strategy notes.
Overview
LinkedIn Mini Sudoku #307 is the LinkedIn Mini Sudoku daily for June 14, 2026. Mini Sudoku is LinkedIn's compact sudoku variant: fill a 6×6 grid so every row, column, and irregular region contains the digits 1 through 6 exactly once. This page includes the live board, a solved-board view, and a step-by-step Solution walkthrough. Difficulty: Hard. Estimated solve time: 6–10 min. Read the explainer sections below for strategy, or jump straight into play.
Answer
This 6×6 Mini Sudoku starts with 9 given digits and fills 27 remaining cells. Layout: 6 regions, 6 cells each.
R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1
Analysis
Case LinkedIn Mini Sudoku #307: 6×6 grid, 9 fixed digits, 27 open cells. Region layout: 6 regions, 6 cells each. Full placement map: R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1.
Board spotlight: Most fills come from scanning rows and columns for cells where only one digit fits — classic naked-single territory. Region geometry (6 regions, 6 cells each) shapes which unit yields the next hidden single.
Evidence block 1: R3C5=1, R4C5=4, R4C6=2, R3C4=6. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 2: R6C5=3, R1C5=5, R5C4=2, R6C4=4. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 3: R2C4=3, R6C6=1, R5C6=5, R6C1=2. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 4: R3C1=5, R3C2=2, R6C2=6, R1C2=3. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 5: R1C1=4, R1C6=6, R1C3=2, R2C1=1. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 6: R2C2=5, R2C3=6, R2C6=4, R4C2=1. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single, Naked single.
Evidence block 7: R4C3=3, R5C1=3, R5C3=1. Chain of reasoning ties givens to these cells via Naked single, Naked single, Naked single.
Mid-solve checkpoint: 13 cells remain after the first half of the chain. Row-scan heavy boards often accelerate once two or three regions close — watch for hidden singles in tight blocks.
Late game: final batches collapse quickly when rows and columns near completion. Every row, column, and region contains digits 1–6 with no repeats. Completed path: R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1.
Verdict: placement set R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1 satisfies all sudoku constraints. Case closed.
Cells
Reasoning
Only 1 fits here — 2 is already in column 5; 3 is already in row 3 and region 4; 4 is already in row 3; 5 is already in region 4; 6 is already in column 5.
Solving note
Naked single at R3C5 in region 4. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 4 fits here — 1 is already in column 5 and region 4; 2 is already in column 5; 3 is already in region 4; 5 is already in row 4 and region 4; 6 is already in row 4 and column 5.
Solving note
Naked single at R4C5 in region 4. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 2 fits here — 1 is already in region 4; 3 is already in column 6 and region 4; 4 is already in row 4 and region 4; 5 is already in row 4 and region 4; 6 is already in row 4.
Solving note
Naked single at R4C6 in region 4. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 6 fits here — 1 is already in row 3 and column 4 and region 4; 2 is already in region 4; 3 is already in row 3 and region 4; 4 is already in row 3 and region 4; 5 is already in column 4 and region 4.
Solving note
Naked single at R3C4 in region 4. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 3 fits here — 1 is already in column 5; 2 is already in column 5; 4 is already in column 5; 5 is already in row 6; 6 is already in column 5 and region 6.
Solving note
Naked single at R6C5 in region 6. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 5 fits here — 1 is already in row 1 and column 5 and region 2; 2 is already in column 5 and region 2; 3 is already in column 5; 4 is already in column 5; 6 is already in column 5.
Solving note
Naked single at R1C5 in region 2. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 2 fits here — 1 is already in column 4; 3 is already in region 6; 4 is already in row 5; 5 is already in column 4; 6 is already in row 5 and column 4 and region 6.
Solving note
Naked single at R5C4 in region 6. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 4 fits here — 1 is already in column 4; 2 is already in column 4 and region 6; 3 is already in row 6 and region 6; 5 is already in row 6 and column 4; 6 is already in column 4 and region 6.
Solving note
Naked single at R6C4 in region 6. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 3 fits here — 1 is already in column 4 and region 2; 2 is already in row 2 and column 4 and region 2; 4 is already in column 4; 5 is already in column 4 and region 2; 6 is already in column 4.
Solving note
Naked single at R2C4 in region 2. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 1 fits here — 2 is already in column 6 and region 6; 3 is already in row 6 and column 6 and region 6; 4 is already in row 6 and region 6; 5 is already in row 6; 6 is already in region 6.
Solving note
Naked single at R6C6 in region 6. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 5 fits here — 1 is already in column 6 and region 6; 2 is already in row 5 and column 6 and region 6; 3 is already in column 6 and region 6; 4 is already in row 5 and region 6; 6 is already in row 5 and region 6.
Solving note
Naked single at R5C6 in region 6. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 2 fits here — 1 is already in row 6; 3 is already in row 6; 4 is already in row 6 and region 5; 5 is already in row 6 and region 5; 6 is already in column 1.
Solving note
Naked single at R6C1 in region 5. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 5 fits here — 1 is already in row 3; 2 is already in column 1; 3 is already in row 3; 4 is already in row 3 and region 3; 6 is already in row 3 and column 1 and region 3.
Solving note
Naked single at R3C1 in region 3. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 2 fits here — 1 is already in row 3; 3 is already in row 3; 4 is already in row 3 and column 2 and region 3; 5 is already in row 3 and region 3; 6 is already in row 3 and region 3.
Solving note
Naked single at R3C2 in region 3. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 6 fits here — 1 is already in row 6; 2 is already in row 6 and column 2 and region 5; 3 is already in row 6; 4 is already in row 6 and column 2 and region 5; 5 is already in row 6 and region 5.
Solving note
Naked single at R6C2 in region 5. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 3 fits here — 1 is already in row 1; 2 is already in column 2; 4 is already in column 2; 5 is already in row 1; 6 is already in column 2.
Solving note
Naked single at R1C2 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 4 fits here — 1 is already in row 1; 2 is already in column 1; 3 is already in row 1 and region 1; 5 is already in row 1 and column 1; 6 is already in column 1.
Solving note
Naked single at R1C1 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 6 fits here — 1 is already in row 1 and column 6 and region 2; 2 is already in column 6 and region 2; 3 is already in row 1 and column 6 and region 2; 4 is already in row 1; 5 is already in row 1 and column 6 and region 2.
Solving note
Naked single at R1C6 in region 2. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 2 fits here — 1 is already in row 1; 3 is already in row 1 and region 1; 4 is already in row 1 and column 3 and region 1; 5 is already in row 1 and column 3; 6 is already in row 1.
Solving note
Naked single at R1C3 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 1 fits here — 2 is already in row 2 and column 1 and region 1; 3 is already in row 2 and region 1; 4 is already in column 1 and region 1; 5 is already in column 1; 6 is already in column 1.
Solving note
Naked single at R2C1 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 5 fits here — 1 is already in row 2 and region 1; 2 is already in row 2 and column 2 and region 1; 3 is already in row 2 and column 2 and region 1; 4 is already in column 2 and region 1; 6 is already in column 2.
Solving note
Naked single at R2C2 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 6 fits here — 1 is already in row 2 and region 1; 2 is already in row 2 and column 3 and region 1; 3 is already in row 2 and region 1; 4 is already in column 3 and region 1; 5 is already in row 2 and column 3 and region 1.
Solving note
Naked single at R2C3 in region 1. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 4 fits here — 1 is already in row 2 and column 6 and region 2; 2 is already in row 2 and column 6 and region 2; 3 is already in row 2 and column 6 and region 2; 5 is already in row 2 and column 6 and region 2; 6 is already in row 2 and column 6 and region 2.
Solving note
Naked single at R2C6 in region 2. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 1 fits here — 2 is already in row 4 and column 2 and region 3; 3 is already in column 2; 4 is already in row 4 and column 2 and region 3; 5 is already in row 4 and column 2 and region 3; 6 is already in row 4 and column 2 and region 3.
Solving note
Naked single at R4C2 in region 3. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 3 fits here — 1 is already in row 4 and region 3; 2 is already in row 4 and column 3 and region 3; 4 is already in row 4 and column 3 and region 3; 5 is already in row 4 and column 3 and region 3; 6 is already in row 4 and column 3 and region 3.
Solving note
Naked single at R4C3 in region 3. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 3 fits here — 1 is already in column 1; 2 is already in row 5 and column 1 and region 5; 4 is already in row 5 and column 1 and region 5; 5 is already in row 5 and column 1 and region 5; 6 is already in row 5 and column 1 and region 5.
Solving note
Naked single at R5C1 in region 5. Only one digit fits this cell after row, column, and region eliminations.
Reasoning
Only 1 fits here — 2 is already in row 5 and column 3 and region 5; 3 is already in row 5 and column 3 and region 5; 4 is already in row 5 and column 3 and region 5; 5 is already in row 5 and column 3 and region 5; 6 is already in row 5 and column 3 and region 5.
Solving note
Naked single at R5C3 in region 5. Only one digit fits this cell after row, column, and region eliminations.
Verification
Evidence supports R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1. Alternative digits at any step would break unit uniqueness or contradict givens.
Every row, column, and region contains digits 1–6 with no repeats.
Solve path
Phase 1: 9 given digits on a 6×6 board with 6 irregular regions — fill every row, column, and region with 1–6 exactly once. Step 1: R3C5 = 1 (naked single). Only 1 fits here — 2 is already in column 5; 3 is already in row 3 and region 4; 4 is already in row 3; 5 is already in region 4; 6 is already in column 5. Step 2: R4C5 = 4 (naked single). Only 4 fits here — 1 is already in column 5 and region 4; 2 is already in column 5; 3 is already in region 4; 5 is already in row 4 and region 4; 6 is already in row 4 and column 5. Step 3: R4C6 = 2 (naked single). Only 2 fits here — 1 is already in region 4; 3 is already in column 6 and region 4; 4 is already in row 4 and region 4; 5 is already in row 4 and region 4; 6 is already in row 4. Step 4: R3C4 = 6 (naked single). Only 6 fits here — 1 is already in row 3 and column 4 and region 4; 2 is already in region 4; 3 is already in row 3 and region 4; 4 is already in row 3 and region 4; 5 is already in column 4 and region 4. Step 5: R6C5 = 3 (naked single). Only 3 fits here — 1 is already in column 5; 2 is already in column 5; 4 is already in column 5; 5 is already in row 6; 6 is already in column 5 and region 6. Step 6: R1C5 = 5 (naked single). Only 5 fits here — 1 is already in row 1 and column 5 and region 2; 2 is already in column 5 and region 2; 3 is already in column 5; 4 is already in column 5; 6 is already in column 5. Step 7: R5C4 = 2 (naked single). Only 2 fits here — 1 is already in column 4; 3 is already in region 6; 4 is already in row 5; 5 is already in column 4; 6 is already in row 5 and column 4 and region 6. Step 8: R6C4 = 4 (naked single). Only 4 fits here — 1 is already in column 4; 2 is already in column 4 and region 6; 3 is already in row 6 and region 6; 5 is already in row 6 and column 4; 6 is already in column 4 and region 6. Step 9: R2C4 = 3 (naked single). Only 3 fits here — 1 is already in column 4 and region 2; 2 is already in row 2 and column 4 and region 2; 4 is already in column 4; 5 is already in column 4 and region 2; 6 is already in column 4. Step 10: R6C6 = 1 (naked single). Only 1 fits here — 2 is already in column 6 and region 6; 3 is already in row 6 and column 6 and region 6; 4 is already in row 6 and region 6; 5 is already in row 6; 6 is already in region 6. Step 11: R5C6 = 5 (naked single). Only 5 fits here — 1 is already in column 6 and region 6; 2 is already in row 5 and column 6 and region 6; 3 is already in column 6 and region 6; 4 is already in row 5 and region 6; 6 is already in row 5 and region 6. Step 12: R6C1 = 2 (naked single). Only 2 fits here — 1 is already in row 6; 3 is already in row 6; 4 is already in row 6 and region 5; 5 is already in row 6 and region 5; 6 is already in column 1. Step 13: R3C1 = 5 (naked single). Only 5 fits here — 1 is already in row 3; 2 is already in column 1; 3 is already in row 3; 4 is already in row 3 and region 3; 6 is already in row 3 and column 1 and region 3. Step 14: R3C2 = 2 (naked single). Only 2 fits here — 1 is already in row 3; 3 is already in row 3; 4 is already in row 3 and column 2 and region 3; 5 is already in row 3 and region 3; 6 is already in row 3 and region 3. Step 15: R6C2 = 6 (naked single). Only 6 fits here — 1 is already in row 6; 2 is already in row 6 and column 2 and region 5; 3 is already in row 6; 4 is already in row 6 and column 2 and region 5; 5 is already in row 6 and region 5. Step 16: R1C2 = 3 (naked single). Only 3 fits here — 1 is already in row 1; 2 is already in column 2; 4 is already in column 2; 5 is already in row 1; 6 is already in column 2. Step 17: R1C1 = 4 (naked single). Only 4 fits here — 1 is already in row 1; 2 is already in column 1; 3 is already in row 1 and region 1; 5 is already in row 1 and column 1; 6 is already in column 1. Step 18: R1C6 = 6 (naked single). Only 6 fits here — 1 is already in row 1 and column 6 and region 2; 2 is already in column 6 and region 2; 3 is already in row 1 and column 6 and region 2; 4 is already in row 1; 5 is already in row 1 and column 6 and region 2. Step 19: R1C3 = 2 (naked single). Only 2 fits here — 1 is already in row 1; 3 is already in row 1 and region 1; 4 is already in row 1 and column 3 and region 1; 5 is already in row 1 and column 3; 6 is already in row 1. Step 20: R2C1 = 1 (naked single). Only 1 fits here — 2 is already in row 2 and column 1 and region 1; 3 is already in row 2 and region 1; 4 is already in column 1 and region 1; 5 is already in column 1; 6 is already in column 1. Step 21: R2C2 = 5 (naked single). Only 5 fits here — 1 is already in row 2 and region 1; 2 is already in row 2 and column 2 and region 1; 3 is already in row 2 and column 2 and region 1; 4 is already in column 2 and region 1; 6 is already in column 2. Step 22: R2C3 = 6 (naked single). Only 6 fits here — 1 is already in row 2 and region 1; 2 is already in row 2 and column 3 and region 1; 3 is already in row 2 and region 1; 4 is already in column 3 and region 1; 5 is already in row 2 and column 3 and region 1. Step 23: R2C6 = 4 (naked single). Only 4 fits here — 1 is already in row 2 and column 6 and region 2; 2 is already in row 2 and column 6 and region 2; 3 is already in row 2 and column 6 and region 2; 5 is already in row 2 and column 6 and region 2; 6 is already in row 2 and column 6 and region 2. Step 24: R4C2 = 1 (naked single). Only 1 fits here — 2 is already in row 4 and column 2 and region 3; 3 is already in column 2; 4 is already in row 4 and column 2 and region 3; 5 is already in row 4 and column 2 and region 3; 6 is already in row 4 and column 2 and region 3. Step 25: R4C3 = 3 (naked single). Only 3 fits here — 1 is already in row 4 and region 3; 2 is already in row 4 and column 3 and region 3; 4 is already in row 4 and column 3 and region 3; 5 is already in row 4 and column 3 and region 3; 6 is already in row 4 and column 3 and region 3. Step 26: R5C1 = 3 (naked single). Only 3 fits here — 1 is already in column 1; 2 is already in row 5 and column 1 and region 5; 4 is already in row 5 and column 1 and region 5; 5 is already in row 5 and column 1 and region 5; 6 is already in row 5 and column 1 and region 5. Step 27: R5C3 = 1 (naked single). Only 1 fits here — 2 is already in row 5 and column 3 and region 5; 3 is already in row 5 and column 3 and region 5; 4 is already in row 5 and column 3 and region 5; 5 is already in row 5 and column 3 and region 5; 6 is already in row 5 and column 3 and region 5. Complete: Every row, column, and region contains digits 1–6 with no repeats.
Pattern
Most fills come from scanning rows and columns for cells where only one digit fits — classic naked-single territory.
Techniques: 27× Naked single
Learn more in Mini Sudoku Puzzle Strategies →Takeaways
Early placements R3C5, R4C5, R4C6 constrained the rest of the grid.
Any candidate that repeats in its row, column, or region is eliminated — most cells have only one option left after givens propagate.
Most fills come from scanning rows and columns for cells where only one digit fits — classic naked-single territory.
Solution
This Mini Sudoku board is 6×6 with 6 regions, 6 cells each and 9 given digits. Unlike classic 9×9 sudoku, the shaded regions here are irregular shapes that overlap rows and columns, so each placement affects multiple groups at once. Every row, column, and region must contain 1 through 6 with no repeats — the hint engine uses naked singles and hidden singles to walk through 27 remaining cells. Most fills come from scanning rows and columns for cells where only one digit fits — classic naked-single territory. Solve order (hint-driven): R3C5=1, R4C5=4, R4C6=2, R3C4=6, R6C5=3, R1C5=5, R5C4=2, R6C4=4, R2C4=3, R6C6=1, R5C6=5, R6C1=2, R3C1=5, R3C2=2, R6C2=6, R1C2=3, R1C1=4, R1C6=6, R1C3=2, R2C1=1, R2C2=5, R2C3=6, R2C6=4, R4C2=1, R4C3=3, R5C1=3, R5C3=1. Use the Solution tab for a cell-by-cell walkthrough with live grid updates, or the Solved board tab for the complete grid at a glance.