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.

February 2026

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

Saturday

February 28, 2026

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.

Easy Play Medium Play Hard Play Expert Play

How to play · Techniques · Quick play