Classic Sudoku 8X8
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How it's different
Classic Sudoku 8x8 shrinks the board down: 8 columns, 8 rows, and only the numbers 1 through 8 - no 9 anywhere. Here's the detail that makes it more than a smaller 9x9: since 8 doesn't split evenly into a 3x3 shape, the boxes on this grid are rectangular, not square - each box spans 2 rows by 4 columns instead of the classic 3x3. Every row, column, and one of these eight 2x4 boxes must still contain each number exactly once. Same fundamental logic as classic Sudoku, just reshaped by the math of a smaller grid.
How to play
Use your keyboard or the number buttons to fill in the blanks - there are only 8 to choose from here, not 9. The same three input modes work exactly as they do everywhere else on zagzook:
Cell First mode: click the cell you want to fill in first, then select the number you want to enter.
Number First mode: select the number you want to enter first, then click the cell you want to fill it into.
Memo mode: pencil in a memo of candidate numbers in a blank cell, instead of committing to one right away.
- Made a mistake? Undo steps back through your moves.
- Stuck? The hint button reveals one correct cell for you.
- This grid has three difficulty levels - Easy, Medium, and Hard - each a genuinely different puzzle.
- Solve the board completely and it submits automatically.
Rules
Fill in the blanks with numbers from 1 to 8. Each row, column, or 2x4 block must contain the numbers 1 through 8 exactly once.
Strategy tips
- Scan full rows before columns. Since each box is wider than it is tall (4 columns, only 2 rows), a completed row rules out more candidates across more boxes at once than a completed column does.
- Watch both rows of a box together. With only 2 rows per box, a number appearing in one row often forces its placement in the other row's remaining columns much faster than in a taller 3-row box.
- Lean on notes early. With only 8 numbers to track instead of 9, pencil-marking every candidate is faster to scan through here - use it more freely than you might on the 9x9 board.
- Start with the fullest rows, columns, and boxes, same as any Sudoku - fewer empty cells means fewer possibilities to rule out.
FAQ
Why does this grid use numbers 1-8 instead of 1-9?
Because the board itself is 8 cells wide and tall - each row, column, and box needs exactly 8 distinct values, so there's no room (or need) for a 9.
Why are the boxes rectangular instead of square?
Since 8 doesn't divide evenly into a 3x3 shape the way 9 does, the natural box layout for an 8x8 grid is 2 rows by 4 columns. It's a mathematical necessity of the grid size, not a design choice.
Is there only one solution to each puzzle?
Yes, same guarantee as every genre on zagzook.
Can I play the same difficulty more than once in a day?
You can, just for fun - but only your first correct solve of the day counts toward today's leaderboard, and that difficulty locks afterward.
Does switching between numbers, letters, icons, and colors change the puzzle?
No - purely visual, the underlying logic never changes.