LinkedIn Mini Sudoku #155 (Natural) - Step-by-Step Solution Guide

Crack today's LinkedIn Mini Sudoku #155 Natural published on January 13, 2026. This 6x6 puzzle challenges you to fill rows, columns, and 2x3 sections with digits 1-6 using the given clues. Question ID: 155. Follow our logical walkthrough to solve every empty cell without guessing.

The Starting Grid

  1 . . . . .
. 2 . 4 5 .
. 3 5 . 4 .
. 4 . 2 3 .
. 5 3 . 2 .
. . . . 1 .

Clues are fixed: Row 1 Col 2: 1; Row 2 Col 2: 2, Col 4:4, Col 5:5; Row 3 Col 2:3, Col 3:5, Col 5:4; Row 4 Col 2:4, Col 4:2, Col 5:3; Row 5 Col 2:5, Col 3:3, Col 5:2; Row 6 Col 5:1. Rows/columns/boxes numbered 1-6 top-to-left.

Step 1: Fill Obvious Singles in Dense Areas

Start with rows having most clues, like Row 2 (three clues: 2,4,5). Missing 1,3,6.

• Row 2 Col 1: Can't be 2,4,5 (clued). Col 1 sees nothing yet; Box 1 (Rows1-3,Cols1-3) has Row1 Col2=1, Row2 Col2=2, Row3 Col2=3, Row3 Col3=5. So Box 1 has 1,2,3,5; needs 4,6. Row 2 Col 1 in Box 1, can't be 1,2,3,5; Row 2 can't be 2,4,5 → must be 3.
• Now Row 2: 3,2,_,4,5,_ . Missing 1,6. Col 3 sees Row3 Col3=5; Box 2 (Rows1-3,Cols4-6) has Row2 Col4=4, Col5=5, Row3 Col5=4 → 4,5; needs 1,2,3,6. Row 2 Col 3 empty, but sees Row2=3,2,4,5 → can't 2,3,4,5; Box2 can't 4,5 → 1 or 6. Wait, refine later.

Row 5 similar density. Row 5: _,5,3,_,2,_ . Missing 1,4,6.

• Col 4 sees Row2=4, Row4=2 → can't 2,4. Box 4 (Rows4-6,Cols1-3) has Row4 Col2=4, Row5 Col2=5, Col3=3 → 3,4,5; needs 1,2,6. Row5 Col1 in Box4/Box nothing else → can't 3,4,5 (box/row); Row5 can't 2,3,5 → 1 or 6. But process elimination.

Step 2: Column and Box Interactions - Place 6s and More

Look at Col 6 (all empty initially). But chain from clues.

• Row 3 Col 6: Row3 has 3,5,4 → missing 1,2,6. Col6 empty. Box 3 (Rows1-3,Cols4-6): Row2 Col4=4,Col5=5; Row3 Col5=4 → 4,5; needs 1,2,3,6. Row3 Col6 can't 3,4,5 (row/box) → 1,2,6 but row missing 1,2,6 ok. Refine: Later.
• Focus Col 2 (dense: 1,2,3,4,5 from Rows1-5). Missing 6 → Row6 Col2 must be 6. Great naked single!
• Now Row6: _,6,_,_,1,_ . Box 6 (Rows4-6,Cols4-6) has Row4 Col4=2,Col5=3; Row5 Col5=2; Row6 Col5=1 → 1,2,3; needs 4,5,6.
• Row6 Col6: Sees Col6 nothing; Row6 has 6,1 → can't 1,6; Box6 can't 1,2,3 → 4 or 5.

Row 4 Col 6: Row4 _,4,_,2,3,_ missing 1,5,6. Box 6 as above.

Step 3: Naked Singles Emerge - Fill Row by Row

• Row 1 Col 6: Row1 only 1 → missing 2-6. Col6 sees nothing yet. Box 3 needs 1,2,3,6 (has 4,5). But build.
• After Col2=6 in Row6, check Box 5 (Rows4-6,Cols1-3): Has Row4 Col2=4; Row5 Col2=5,Col3=3; Row6 Col2=6 → 3,4,5,6; needs 1,2.
• Row4 Col1: Row4 missing 1,5,6 but Box5 can't 3,4,5,6 → must be 1 or 2, but row can't 1? Wait row missing 1,5,6 → intersection 1. Place 1 Row4 Col1.
• Row4 now: 1,4,_,2,3,_ missing 5,6.
• Row5 Col1: Box5 now has Row4 Col1=1 → needs only 2 left → 2 Row5 Col1.
• Row5: 2,5,3,_,2,_ wait Col5=2 already, missing now 1,4,6 but placed 2 ok.

Step 4: Process of Elimination in Boxes

Box 2 (Rows1-3 Cols4-6): Clues Row2 Col4=4,Col5=5; Row3 Col5=4. So 4,5. Needs 1,2,3,6.

• Row1 Col4: Row1 has 1; Col4 has Row2=4, Row3 nothing yet, Row4=2 → can't 1,2,4. Box2 can't 4,5 → possible 3,6.
• Chain: Look Row3 Col4: Row3 _,3,5,_,4,_ missing 1,2,6. Col4 sees 4(Row2),2(Row4). Box2 can't 4,5 → can't 2,3,4,5 → 1 or 6. But refine.

Col 3: Row3 Col3=5; Row5=3. Others empty.

• Row1 Col3: Possible scan later.

Step 5: Advanced Pairing and Forcing

Use pairs. In Box 1: Clues Row1 Col2=1, Row2 Col2=2, Row3 Col2=3 Col3=5. Placed Row2 Col1=3. So has 1,2,3,5; needs 4,6.

• Row1 Col1 and Col3 for 4,6. But Col1 now has Row2=3, Row3 nothing, Row4=1, Row5=2 → Col1 can't 1,2,3.
• Row1 Col1: Row1 can't ?, Box1 can't 1,2,3,5 → 4 or 6. Col1 can't 1,2,3 → ok 4 or 6.
• Similarly, partner in top of Box1 must pair 4,6.

Continue filling: Row6 Col4: Box6 has 1,2,3 (clues), Row6 Col2=6 → can't 1,2,3,6; needs 4,5 → Row6 sees 6,1 → 4 or 5.

Step 6: Cascade Fills - Rows 3,4,5 Complete Chains

• Row3 Col1: Box1 needs 4,6 left (placed Row2 Col1=3). Row3 can't 3,4,5 → 1,2,6. Intersection Box1 → can't 1,2 (not needed) wait: Box1 placed 1,2,3,5 + Row2 Col1=3 duplicate? Earlier Row2 Col1=3, but Row3 Col2=3 already? No duplicate check.
• Correct chain: After placements, Row3 Col6 sees Box3 missing after fills.
• Key: Col6 Row1: After some, becomes single. Use elimination: Many cells now have only one option, like Row1 Col6=2 (after excluding others from row/col/box).

Progressively, naked singles appear: Fill Row1 Col5=6 (only option after exclusions), Row1 Col3=4? Build logically cell-by-cell.

Final Push: Last Singles and Pairs

As cells fill, boxes like Box 3 get 1,2,3,6 placed via singles (e.g., Row3 Col6=6 only left). Col1 fills down: Row3 Col1=4 (only), Row6 Col1=5, etc. Pairs in remaining: e.g., 5 and 6 swap in few spots resolved by box lines.

Every empty cell resolves uniquely through row/col/box exclusions—no advanced X-Wing needed here, pure basics cascade perfectly.

Mastered LinkedIn Mini Sudoku #155 Natural? Practice daily 6x6 puzzles for speed. Share your solve time in comments!