LinkedIn 6x6 Sudoku #252 Pro-Tips Speed-Run

LinkedIn 6x6 Sudoku #252: Speed-Run Breakdown

Grid hits you with a solid opener: row 1 packed 4-2-3-5, row 2 bookends 6 and 4, row 3 starts 5-1. Boxes constrain tight in this 6x6 arena. No naked singles scream out, so dive into cross-hatching on 1s early. Trace 1 in row 3 col 2 across row 3 and col 2: pins possibilities fast in box 1 and box 4.

Pro-Tip 1: Cross-Hatch Like a Laser on Box Boundaries

In 6x6, boxes are 2x3, so lines slice cleaner. Target number 1: givens at (3,2) block row 3 entirely for 1s, col 2 blocks down. Hatch through box 1 (rows 1-2, cols 1-3): only (1,5) or (2,3) survive initially, but row constraints kill (2,3). Boom, (1,5)=1. Fill it, ripple updates row 1 and box 2.

Chain to number 6 in box 4: givens at (4,5) and (2,6) hatch out row 4 and col 6. Last spot in box 4? (3,6)=6. That's your first cascade.

Pro-Tip 2: Hunt Hidden Singles in Almost-Full Units

Row 2 now breathes: after 1 and 6 placements, scan for hidden single 5. Only one cell in row 2 takes 5 without box or col clash: (2,2)=5. Pencil marks reveal it hiding amid clutter. Fill, then row 2 unlocks (2,3)=1 via naked single.

Columns mirror this: col 6 post-fills shows hidden 3 at (5,6)=3. Keep momentum, check every near-full row/col/box after each placement.

The Crucial Square: Row 5, Col 2 – The Crack

Row 5 is your Difficult Row, sparse with just (5,1)=1 and (5,6)=2. Early fills tease it, but stall. Post-cross-hatch on 3s and 4s across boxes 4-6, row 5 col 2 emerges as hidden single for 3: only spot for 3 in row 5, dodging box 4's 3 at (4,1) and col 2's blocks.

Set (5,2)=3. This cracks the grid open. Row 5 naked single 5 at (5,3), then hidden 6 at (5,4). Col 2 fills top-down: (4,2)=4. Box 3 gets 2 at (3,3). Suddenly, chains fire: row 4 (4,3)=2, box 5 hidden 1 at (6,1)=2 wait no, pivot to solution flow.

Pro-Tip 3: Cascade Closes the Speed-Run

From row 5 break:

• Box 3: hidden 6 at (3,3)=6 after row scans.
• Col 4: naked 4 at (3,4)=4.
• Row 6: cross-hatch 6 pins (6,2)=6.
• Box 6 full house forces (6,5)=5, (5,5)=4.

Row 4 hidden pairs shrink to singles: (4,2)=4, (4,4)=1. Final boxes slot via elimination. Total moves: under 20 fills, pure logic.

6x6 Edge: Why This Wins Tournaments

Tighter grid means fewer candidates per cell. Prioritize box-row intersects for cross-hatch. Always recheck the Difficult Row 5 after box progress. Practice spotting that (5,2)=3 hidden single: it's the 'Aha!' pivot from grind to glide. Next #252 variant, you'll sub-2-min it.