LinkedIn 6x6 Sudoku #221 Pro-Tips Speed-Run

LinkedIn 6x6 Sudoku #221: Speed-Run Breakdown

Grid hits you with a loaded row 2 (2 3 4 5 _ _) and scattered givens. Early fills are straightforward, but row 4 stalls hard. Here's the tactical path to crack it fast.

Opening Moves: Naked Singles Everywhere

Start in row 1. Column 1 empty? No 1 or 6 in box or column peers. Row 2 owns 2-5, so row 1 grabs 6 1 left side. Cross-hatch column 6: row 2/3 block out 1 2, forcing 3 top-right. Boom, row 1: 6 1 5 4 2 3.

Row 3: 1 _ _ 6 _ _. Column 2 scan eliminates 3 5 from row 2/5, hidden single 5. Column 3: 3 squeezes in. Right side mirrors: 4 2. Full row: 1 5 3 6 4 2.

The Difficult Row: Row 4's Brutal Lock

Row 4 all empty. Boxes force candidates: left box sees 1 2 5 6 nearby, middle 3 4 blocked. But column 1: 6 2 1 placed, 3 4 5 row 5/6. Cross-hatch row 4 column 1: only 4 fits box/column. Crucial square: Row 4, column 1 = 4. This cracks it open.

Pro-Tip: Cross-Hatching in 6x6 Tightens Fast

6x6 means fewer cells, so cross-hatching dominates. Pencil top-left empty in row 4? Slash column peers (6 2 1), box peers (5), row 5 2. Only 4 survives. Place it, re-scan: column 1 now 6 2 1 4 3 5. Row 5 left box hidden single 3 column 2.

Hidden Singles Unleash the Chain

Post-4, row 4 column 2: candidates 6 3, but row peers kill 3, hidden single 6. Column 3 row 4: 2 only option left. Middle box row 4: 3 slots column 4. Boom, row 4: 4 6 2 3 1 5.

Row 5: _ 2 6 1 5 _. Column 1 3 hidden (peers block rest). Column 6: 4. Full: 3 2 6 1 5 4.

Row 6 cleans up: column 1 5, and it cascades. Final grid flows clean.

Speed-Run Keys for #221

• Box-Row Priority: Row 2 givens dictate row 1 top fast.
• Crucial Square Drill: R4C1 4 via cross-hatch. Stare at empties, slash ruthlessly.
• Re-Scan Ritual: Every placement, hit columns next. 6x6 propagates like lightning.
• Avoid Trap: Don't chase row 6 early; row 4 unlock feeds everything.

Nail this, and #221 drops under 90 seconds. Spot that R4C1 cross-hatch early, grid surrenders. Next puzzle, same weapons.