LinkedIn 6x6 Sudoku #254 Pro-Tips Speed-Run

LinkedIn 6x6 Sudoku #254: Speed-Run Pro-Tips

Grid hits you with givens in top-right 6, row 2's 1,2, row 3's 3,4, and scattered 5,4,1,5 in the bottom. It's a tight 6x6 beast—boxes are 2x3, numbers 1-6. No fluff: dive straight into cross-hatching for quick wins, then hunt hidden singles to build momentum. This one's a speed-run candidate if you nail the Crucial Square early.

Cross-Hatching: Your Opening Salvo

Start with cross-hatching on the 6 in row 1, column 6. In 6x6, boxes split rows 1-2/3-4/5-6 and columns 1-3/4-6. Draw mental lines from that 6 across its row and column. Box 1 (rows 1-2, cols 1-3) needs a 6—slash out row 1 entirely, column 6 is blocked outside. Only row 2, col 1-3 open? Nah, check givens: row 2 has 1,2 in cols 2-3, so 6 pins to row 2, col 1. Boom, first placement.

Repeat on 5s: one in row 4 col 4, another row 5 col 5. Cross-hatch box 4 (rows 3-4, cols 4-6)—eliminates chunks, reveals 5 can't squeeze elsewhere. Chain these: every placement triggers a re-scan. Pro move: cycle numbers 1-6 box-by-box, not row-by-row. In #254, this clears row 2 fast.

Hidden Singles: The Silent Killers

Once candidates thin, hidden singles emerge. Pencil-mark empties (mentally or on-screen). Look for a number that only fits one cell in its row/column/box. Row 6 starts with 2 in col 1—hunt where 1 hides. Givens block most: 1 in row 2 col 2, row 5 col 4. In row 6, only col 3 works without box/column clash. Place it, watch naked singles pop.

Integrate: cross-hatch to prune candidates, then scan for hiddens. In #254, row 3 col 2 screams hidden 3 early—3 in row 3 col 2 is blocked elsewhere by the given 3 in col 2? Wait, sharpen: after initial fills, row 4 needs 2 only in col 2. Fill, cascade hits column 2 clean.

The Difficult Row: Row 4's Lockbreaker

Difficult Row: Row 4—givens 5 col 4, 4 col 5, empty elsewhere. Looks stalled, but cross-hatch 1: blocked by row 5's 1, column clashes. Candidates dwindle to 1,2,6 in cols 1-3, but box 4 rules force 1 out of col 3. Hidden single: 6 only fits col 3. Place row 4 col 3 = 6.

That's your momentum shift—unlocks column 3, reveals naked 6 in row 1 col 4. Row 4 cracks wide: 1 col 1 (hidden, box 4), 2 col 2. Full row: 1,2,6,5,4,3. Speed-run pro-tip: always hit almost-full rows first.

Crucial Square: Row 5 Col 2 = 6

The Crucial Square: Row 5, col 2. After row 4 breaks, pencil col 2: candidates 5,6 top, but givens kill 5 (row 5 col 5). Box 5 (rows 5-6, cols 1-3) has 2 row 6 col 1—6 hides only here. Drop 6 in r5c2.

Aha! This shatters the grid. Column 2 fills top-down: row 1 4 (naked single), row 3 3, row 6 5. Box 2 cascades: row 2 col 1 already 6, so row 1 col 3 5. Chain reaction hits every box—3 row 1 col 1, 2 row 1 col 4. From here, it's naked singles all the way. Total speed-run: under 90 seconds if you flow.

Final Crack: How It All Clicked

Post r5c2 6, box 1 locked (rows 1-2 cols 1-3): 3,4,5 permute fast—3 r1c1 (hidden col 1), 4 r1c2, 5 r1c3. Row 1 finishes 2,1,6. Box 6 mirrors: row 6 col 6 4 last remaining. Every unit chains off that crucial square. Tactical edge: re-cross-hatch 4s after each fill—exposes the endgame.

Drill this on #254: cross-hatch givens, hammer row 4, seize r5c2. You're sub-60 next time. Grid conquered.