LinkedIn 6x6 Sudoku #210 Pro-Tips

LinkedIn 6x6 Sudoku #210: Speed-Run Breakdown

LinkedIn 6x6 Sudoku #210 starts deceptively open but tightens fast in the bottom blocks. Scan for quick wins in rows 1 and 2, where givens like 2-6-4-5 and 1-6 box you into early placements. Your first move: cross-hatch column 6. Spot the 5 and 6 locking out options, forcing a hidden single right away.

Pro-Tip 1: Cross-Hatching in Tight 6x6 Columns

Cross-hatching shines here. Take column 2: givens at row1 null, row2 null, row4=4. Eliminate 4 from row5 and row6 possibilities using the top block's constraints. Numbers 1-3-5-6 vie for spots, but row1's block with 2-6 forces 3 into row1 col2. Pencil-mark ruthlessly: strike 3 from column 2's remaining cells. This drops a naked single in row2 col2=5. Boom, chain reaction.

Pro-Tip 2: Hidden Singles in Block Overlaps

Mid-solve, row 3 col1 screams hidden single for 3. Why? Block1 misses 3, column1 blocks 1-2 with givens and prior fills. Only one spot fits without row clash. Fill it, then ripple: unlocks row3 col2=1 via column exclusion. In 6x6, blocks are 2x3 rectangles, so overlaps hit harder, creating these gems faster than 9x9.

Crucial Square: Row4 Col1 = The Crack

The Difficult Row is row 4: givens at col2=4, col5=3. Feels stuck until column1 analysis. Top block filled, row5 col1 can't take 6 (column block), row6 col1 blocks 5. Cross-check row4 block: misses 6 early, but pairs in col4 force 6 into row4 col1. This crucial square cracks it open. Fill row4 col1=6, and row4 cascades: col3=5 via naked pair, col4=1 hidden single, col6=2 column lock. Bottom block floods next.

Pro-Tip 3: Block Propagation for Speed

Post-crack, bottom-right block: row5 col6 must be 3 (row miss, column exclude 1-5-6). Then row6 col6=1 given confirms. Hunt pairs: row5 sees 4-2-1-6-5-3 pairing off, forcing exact spots. Row6 col2=6 via block single. Alternating row-column-block scans post-fill keeps momentum. No guesswork, pure logic chains.

Final Sprint Technique

Once top two rows lock (row1: 2-3-6-4-1-5; row2:1-5-4-3-2-6), mirror to bottom. Row3 col1=3 triggers left column fill: 3-1 down. Crucial row4=6-4-5-1-3-2 drops row5=4-2-1-6-5-3 via vertical pairs. Last row6 slots 5-6-3-2-4-1 clean. Total speed-run: under 2 minutes spotting that row4 col1 pivot. Practice these on #210, and tougher grids fold the same way.