Sudoking
One sudoku a day, the same puzzle for everyone. No timers or scores cluttering the board while you play; the background quietly evolves as you make progress. Finish it and see how your time ranks against every other player that day, then wait for tomorrow's puzzle.
Long-press a key to pencil in candidates; they clear themselves as digits land. A key gets a corner tab once all nine of its digit are placed. Left last night's puzzle unfinished? You can still complete it the next day before it's replaced.
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