Time00:00
Mistakes0/3
Hints3
1Fill the grid so each row, column, and 3×3 box contains 1-9
2The highlighted extra regions must also contain 1-9
3Numbers must not repeat within any extra region
4Use the extra region constraint to narrow down possibilities
1-9 1-9: Place number in selected cell
⌫ Backspace/Delete: Erase selected cell
Ctrl+Z Ctrl+Z: Undo last move
←↑→↓ Arrow keys: Navigate between cells
What is Daily Extra Region Sudoku?
Daily Extra Region Sudoku adds four extra 3×3 regions to the classic 9×9 grid. These additional regions overlap the standard boxes and must also contain the digits 1 through 9 exactly once. Standard row, column, and 3×3 box rules still apply.
This variant supports all four difficulty levels (Easy, Medium, Hard, Expert) following the weekly schedule. The daily puzzle is the same for every player worldwide, refreshed at midnight UTC.
Why Play Daily Extra Region Sudoku?
Extra Constraint Layer
Four additional 3×3 regions mean more constraints per cell — perfect for solvers who want a deeper challenge beyond classic Sudoku.
Fresh Puzzle Daily
A brand-new Extra Region Sudoku every day at midnight UTC. Same puzzle for all players worldwide.
Track Your Streak
Build a daily habit with streak tracking. How many consecutive days can you solve?
Full Archive Access
Play any past date going back to day one. Master every difficulty at your own pace.
Play Instantly
No sign-up, no ads, no downloads. Open and play right in your browser.
Works Everywhere
Fully responsive design — play comfortably on desktop, tablet, or phone.
Extra Region Sudoku Solving Tips
✓Check Extra Regions First — Before placing a number, verify it doesn't already appear in any extra 3×3 region that contains that cell.
✓Region Intersections — Cells at the intersection of a standard box and an extra region are the most constrained. Use these to narrow down candidates quickly.
✓Scan Extra Regions — Scan the four extra regions the same way you scan rows, columns, and boxes. A missing digit often reveals placements across multiple boxes.
✓Center Cells Matter — The center of the grid has the most overlapping constraints. Solving these early reduces possibilities everywhere.
✓Cross-Reference — Use extra region constraints together with standard constraints. A number excluded from an extra region position narrows candidates in that row or column.
✓Use Pencil Marks — Mark candidates considering all constraint groups: rows, columns, standard boxes, and the four extra regions.
✓Start with Overlaps — Cells that belong to both a standard box and an extra region have the tightest constraints. Prioritize solving these first.