LinkedIn 6x6 Sudoku #260 Pro-Tips Speed-Run

LinkedIn 6x6 Sudoku #260: Speed-Run Breakdown

Grid hits you with a tight 6x6 setup: givens lock rows 1-3 solid up top, but the bottom sprawls open. Row 4's sparse—only 1 and 2 in columns 5-6—screams early chaos. This one's no beginner filler; it demands sharp scanning to avoid dead ends. Speed-run it by prioritizing cross-hatching on 1s and 2s, then hunt hidden singles in the mid-blocks.

Opening Moves: Cross-Hatch the 1s

Start with 1. Givens pin it at (1,1), (4,5), (5,2), (6,2). In 6x6, boxes are 2x3—scan row 1's 1 to slash column possibilities in box 2 (rows 1-2, cols 4-6). No spot left but row 2, col 6. Boom, drop the 1 there. That's classic cross-hatching: mentally slash rows/cols from known 1s, leaving one cell glowing in the box.

Chain it to 2s next. Top-left box forces a 2 into row 1, col 2 via cross-hatch from row 3's 2 and col 1's empty scan. Each placement ripples—update your mental pencilmarks fast.

Hidden Singles Emerge: The Momentum Builder

Post-cross-hatch, row 1 unlocks a hidden single for 6—only col 3 fits without block/row clash. Hidden singles shine in 6x6: pick a row like 3, digit 5. Scan empties; block-ins block all but one cell. Fill it, and watch naked singles pop in adjacent cols.

Pro move: cycle boxes top-to-bottom. After 1s/2s settle top, row 4's col 1 gets a naked 5—last digit standing after eliminations.

Crucial Square: Row 3, Col 3

Here's the crucial square: row 3, column 3. After cross-hatching 1s into row 2 col 6 and 6s elsewhere, this cell cracks as the hidden single for 1. Why? Row 3 blocks from givens (2 at col1, 4 at col2); col 3 empty except this box's lone spot after slashes from (1,1) and others. Drop the 1. Boom—row 3 cascades: col 5 must be 3 (hidden single), col 4 gets 6. The grid fractures open here. Upper half fills; bottom mirrors the chain.

Difficult Row: Row 4's Gauntlet

Row 4 fights back—empties everywhere, 1 and 2 pinning the end. Cross-hatch 6s first: from row 1 col 5's 4 and row 2 col 5's 6, only col 4 fits. Then 3 in col 2 via hidden single (row blocks elsewhere). Once row 3 cracks, row 4's col 3 lands 3—full house forces the rest. Tip: in sparse rows, pair cross-hatch with box singles; 6x6 density amplifies the chain.

Final Push: Full Grid Unlocks

Row 3 col 3's 1 triggers the dominoes. Row 4 fills via propagating singles; row 5 grabs 6 in col 1 (cross-hatch from row 6's empties); row 6 slots 4 up top. Last boxes resolve naked—solution snaps in under 90 seconds with practice. Key: trust cross-hatching early, never skip hidden single checks per row. You've got this—next one's yours faster.