LinkedIn Mini Sudoku #456: Pro-Tips Guide

Speed-Run Read

LinkedIn Mini Sudoku #456 is a compact 6x6 grid built around 2x3 boxes. The winning rhythm is simple: scan the tightest row, use cross-hatching to restrict each digit, then rescan the affected column and box immediately.

Start with the nearly constrained lines rather than scattering guesses. Row 3 contains 5, ., 4, ., 1, ., so its missing set is {2,3,6}. Column 3 already carries 3, ., 4, ., 5, ., which forces the missing values into a narrow pattern. That interaction quickly places 1 in row 2, column 3, and the upper-middle box begins to stabilize.

The Crucial Square

The key breakthrough is the middle-left box, covering rows 3 and 4 and columns 1 through 3. Its givens are 5, 4, and 1. Cross-hatching against the surrounding rows and columns leaves 2 as the only viable value for row 4, column 1.

That square is the hinge. Once r4c1=2 is placed, row 4 is missing {4,6} in its remaining open positions. Column 3 then rejects 4 from row 4, column 3, so r4c3=6 and r4c5=4. The row is solved without a guess.

The Difficult Row

Row 6 looks unhelpful at first: ., ., ., 5, ., 1. Its missing set is {2,3,4,6}, and several candidates appear possible. The trick is to postpone it until the lower boxes have more information.

After the middle and lower-left regions tighten, column 1 contains 6, ., 5, 2, ., .. The remaining values are {1,3,4}; row 6 can take only 3, so r6c1=3. That immediately reduces row 6 to {2,4,6}. Cross-hatching through the bottom-middle box then forces r6c3=2, followed by r6c2=4 and r6c5=6.

Hidden Singles to Finish

With the lower band resolved, the final placements come from hidden singles, not brute force. In each affected row, look for a digit that has only one legal home even when several cells remain blank.

• Row 1 reduces to {1,2,4,5}; column pressure places 2 in column 2, then 1 in column 4.
• Row 2 follows once its box loses the competing candidates, yielding 4,5,1,2,3,6.
• Row 3 closes with 5,3,4,6,1,2 after the middle-right box identifies its lone 6.
• Rows 4 through 6 now resolve cleanly as the columns each receive the full set 1 through 6.

Final Grid

6 2 3 1 5 4
4 5 1 2 3 6
5 3 4 6 1 2
2 1 6 3 4 5
1 6 5 4 2 3
3 4 2 5 6 1

The final check is tactical: verify every row, every column, and every 2x3 box contains 1 through 6 exactly once. The lesson from #456 is to attack intersections, not isolated blanks. The crucial square opened the center, the difficult bottom row surrendered under column pressure, and the finish arrived through disciplined hidden singles.