Sudoku 129 Better 〈NEWEST – 2025〉

: Because every row, column, and block contains 1–9, the sum of all numbers in any one of these units is always exactly 45 . This is particularly useful in variants like "Killer Sudoku."

When you have a candidate number (say, a '5') that only appears twice in two different rows, and those twos line up in the same two columns, you have an X-Wing. This allows you to eliminate that '5' from all other cells in those columns. sudoku 129 better

| Mistake | 129 Better Fix | |---------|----------------| | Placing a number without checking box | Always check all three units (row, col, box) | | Over-penciling (4+ candidates) | Pencil only when 2–3 candidates | | Ignoring hidden singles in columns | Scan columns separately from rows | | Rushing and missing a naked pair | After each placement, scan for new pairs | | Using guesswork in “hard” puzzles | There’s always a logical path — find it | : Because every row, column, and block contains