LinkedIn 6x6 Sudoku #433 Speed-Run Guide

The Speed-Run Plan

LinkedIn 6x6 Sudoku #433 uses digits 1 through 6, with each row, column, and 2-by-3 box containing every digit exactly once. The opening position looks sparse, but the clues are arranged to reward disciplined cross-hatching rather than guesswork.

Start by marking the missing digits in each row and column. The given 1s and 2s are especially useful: they create immediate restrictions across the upper-left and central boxes, while the 3, 4, 5, and 6 clues anchor the right and lower sections.

Pro-Tips for #433

1. Cross-hatch from the anchored clues

Take a known digit and sweep it through its row, column, and box. For example, the 1 in the top row blocks that digit from the rest of its row and its 2-by-3 box. The other 1s then narrow the legal positions in the remaining boxes.

Repeat that scan with 2 and 3. In a 6x6 grid, each clue removes a larger percentage of possibilities than it would in a standard 9x9 puzzle, so every placement has leverage.

2. Hunt hidden singles, not just open cells

Several rows initially have multiple blanks, but one missing digit can appear in only one legal position after column and box restrictions are applied. That is a hidden single. Do not wait for a row to have one empty square; inspect where each missing digit can go.

The lower-left area is a good example. Once the visible 2 and 6 constraints are combined with the column data, the remaining candidates collapse quickly. This creates a chain into the bottom middle and bottom-right boxes.

3. The crucial square

The key breakthrough is the upper-middle box, especially the square at row 1, column 4. Its row, column, and box restrictions leave 4 as the only viable digit.

That placement is more valuable than it looks. It fixes the rest of the top row as 2, 5, 6, 4, 1, 3, which then supplies fresh blockers for the two rows beneath it. This is the point where the puzzle stops behaving like a loose collection of candidates and starts resolving as a forced sequence.

Finishing the Chain

With the top row settled, cross-hatch the new 4, 5, and 6 placements through their columns. The second row then resolves to 4, 1, 3, 2, 6, 5, and the third row follows as 1, 2, 4, 5, 3, 6.

In the lower half, avoid filling by visual symmetry. Use the box boundaries. The fourth row is forced to 6, 3, 5, 1, 2, 4; that row then removes the final competing candidates from the middle boxes. The fifth and sixth rows complete as 3, 4, 2, 6, 5, 1 and 5, 6, 1, 3, 4, 2.

Final Check

The completed grid is:

2 5 6 | 4 1 3
4 1 3 | 2 6 5
------+------
1 2 4 | 5 3 6
6 3 5 | 1 2 4
------+------
3 4 2 | 6 5 1
5 6 1 | 3 4 2

Every row, column, and 2-by-3 box contains 1 through 6 exactly once. The speed-run lesson from #433 is simple: find the square with the tightest three-way restriction, then let each confirmed digit do the blocking work for you.