A daily Sudoku for iPhone
One 6x6 Sudoku a day.
Free. No ads, ever.
One 6x6 Sudoku a day.
The same one for everyone.
Two to six minutes. Prove it, see where you rank tonight, and beat your people in private circles. One a day is free forever. Want more? Lemma Plus gives you thousands, at four difficulties.
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Lemma #2141:42Proven
- 36cells, never a guess
- 1free lemma a day, at midnight your time
- ∞more with Lemma Plus, they never run out
- 0ads, ever
How it works
- Open tonight's lemmaEveryone on Earth gets the same puzzle on their own date. No levels to grind, no energy bar.
- Prove itPure logic. Stuck? A hint shows its reasoning, like a margin note, not the answer.
- See where you standYour rank among tonight's solvers, your circle's board, and a share card with no spoilers.
What you get
Your sequenceProve a lemma every day and the sequence grows. A freeze saves the day you miss.
Co-authorsPrivate circles for family and friends. Times only, never the numbers, so nobody spoils it.
Hints that teachEvery hint names the rule it uses, so next time you see it yourself.
Lemma Plus
One a day not enough? Play thousands.
Corollaries are fresh lemmas made on your phone, at the difficulty you pick. They never run out. The archive opens every daily lemma you missed.
- Unlimited corollaries: easy, medium, hard, expert
- The archive: every past daily lemma
- Every ink, paper and app icon from your theorems
$19.99 a year with 7 days free, or $2.99 a month. Cancel any time.