Killer Sudoku challenges
Same dated puzzles as our Sudoku calendar—use them to sharpen logic you’ll apply when combining cages and sums on paper or in apps that render cages.
The calendar highlights the last 90 days through Jun 13, 2026. Any past date still opens if you use a direct link (for example /challenges?date=… or /play/challenge/… from social). Future dates are not available yet.
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Play this day
Wednesday
December 31, 2025
Each date has four fixed puzzles (one per level). Select a level to start — timer, notes, hints, and undo work the same as in quick play.