LinkedIn 6x6 Sudoku #320: The Crucial Square That Cracked the Grid

Pro-Tips for LinkedIn 6x6 Sudoku #320

If you're tackling LinkedIn 6x6 Sudoku #320, you're in for a tight, logic-driven puzzle that rewards precision over guesswork. This 6x6 grid isn't just about filling numbers 1–6; it's about spotting the one cell that unlocks the entire board. Veteran solvers know the key: start in the most constrained areas.

The Crucial Square That Cracked the Grid

In #320, the breakthrough came at Row 2, Column 1 (R2C1). Initially, it looked like a toss-up between 5 and 6. But applying Cross-Hatching—checking the row, column, and 2x3 block for eliminations—revealed that only 6 could fit. Placing that 6 triggered a cascade: R2C4 became 1, R3C2 became 1, and the center block exploded with hidden singles.

Hidden Singles in a 6x6 Layout

Unlike 9x9, the 2x3 blocks in 6x6 are smaller, making Hidden Singles more frequent. For example, in #320, the number 4 was missing in Block 4 (R3–R4, C3–C4). Only two cells were open, but one was blocked by a 4 in Row 3. That left R4C3 as the only valid spot. This is a classic Hidden Single: one number, one place.

Pro Moves for Speed-Running #320

• Pencil Marks First: Scan every empty cell and write candidates. Don't fill until you see a naked single.
• Focus on One Number: Pick 6 first. It appears three times already. That leaves three more spots—find them by elimination.
• Block-by-Block Logic: In 6x6, blocks are your best friends. Solve Block 1 (R1–R2, C1–C3) first. It has 4 pre-filled numbers—easy to crack.
• Watch for Pairs: If two cells in a row share {2,5}, no other cell in that row can be 2 or 5. Use this to eliminate.