LinkedIn 6x6 Sudoku #426 Speed-Run Guide

The Speed-Run Mindset

LinkedIn 6x6 Sudoku #426 rewards disciplined scanning rather than brute force. Work with the digits 1 through 6, and remember that each box is a compact 2-by-3 region. The fastest route is to attack the crowded intersections first, then let each placement sharpen the next one.

Opening Salvo: Cross-Hatching

Start with the digit 1. It is already fixed in the top-left box, so use its row and column lines to restrict the remaining boxes. Do the same with 2, 3, and 5. In a 6x6 grid, these sweeps are powerful because each box has only six cells and every blocked row or column removes a large fraction of the options.

Do not fill a square merely because it has several plausible candidates. Instead, ask: where can this digit go within the box? That question exposes hidden singles faster than scanning cell by cell.

The Crucial Square

The breakthrough comes in the middle-left area, where the given 3 and 4 constrain the missing values sharply. Cross-hatching the digit 1 leaves only one legal position in that box. Once that hidden single is placed, the surrounding row and column lose their ambiguity.

That placement is the grid's crucial square. It does not look dramatic in isolation, but it links three regions at once. The affected row gains a forced 6, while the adjoining column narrows to a single home for 2. This is the classic 6x6 chain: one quiet intersection, followed by several obvious consequences.

Attack the Difficult Row

Next, focus on row 4. Its existing 4 and 6 make it a useful control row, but the middle cells initially resist a naked-single approach. Use the box boundaries instead. The digit 2 can occupy only one remaining position in the row's middle box, making it a hidden single.

With 2 locked in, the row reduces rapidly. The remaining candidates resolve as 5, then 1, giving the completed pattern 5 4 2 1 3 6. This is the moment to stop broad scanning and switch to a tight row-column sweep.

Finish with Controlled Sweeps

Top band

The top two boxes now exchange enough information to settle row 1. The existing 1 and the newly restricted columns force 3 into the fourth position, followed by 4 and 2. Row 2 then closes around its given 2 and 6.

Middle and bottom bands

Use the same method on the lower boxes. The given 5 in row 5 and the given 5 in row 6 create a useful column lock. Hidden singles place the missing values without guessing, and the bottom row finishes as 1 6 4 5 2 3.

Final Answer

The completed solution is:

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

The key lesson from #426 is simple: cross-hatch first, hunt hidden singles second, and only then chase the nearly complete rows. The crucial square in the middle-left box creates the opening, and the difficult fourth row converts it into a full-grid cascade.