Logic

Deduce Daily

One hard logic puzzle a day, the same board for everyone until midnight UTC, with no hints.

Every day: One hard puzzle a day, drawn in turn from its logic games (Killer Sudoku, Nonogram, Kakuro and others), the same board for everyone until midnight UTC, with no hints and no way to re-deal. New puzzle: Midnight UTC.

Play Deduce Daily on deducedaily.com

Today's puzzle on Deduce DailyDeduce Daily on the App StoreDeduce Daily on Google Play

Deduce Daily's Today puzzle, a Killer Sudoku with dotted cages and sums, and a digit pad below

Deduce Daily is a collection of logic puzzles on the web, iPhone and Android with one shared challenge each day: a single hard puzzle drawn from its games, the same board for everyone until midnight UTC. The daily has no hints and cannot be re-dealt, so a streak means you finished it on your own.

About Deduce Daily

Deduce Daily gathers the quiet kind of puzzle, the sort you solve by noticing something rather than guessing. Its library runs to nearly twenty games: Nonogram, Kakuro, Killer Sudoku, Futoshiki, Slitherlink, Logic Grid, Binairo, Suguru, Light Up, Bridges, Net, Threads, One Line, Grand Tour, Map Color, Memory Match, a sliding puzzle, mazes and an ice maze where you slide until something stops you.

Today's puzzle is one hard board a day, drawn from the logic games, and the same for everyone playing anywhere until it changes at midnight UTC. The store screenshots show a hard Killer Sudoku as the day's board. The daily deliberately has no hints, since it would not be the same challenge if some players had help, and there is no way to re-deal it.

Outside the daily, every game has three difficulties, tuned by measuring how much work a puzzle takes. Hints reveal the next real move, and a check tells you where you went wrong. Every board is generated on the device from a seed, so the apps work with no connection at all, and the rules and strategy notes sit beside each board. Colour is never the only way a board shows something.

Deduce Daily is made by ZW Studio LLC and came out in September 2026. It needs no account or sign-up, and progress stays on your device. The day's puzzle can be played on deducedaily.com as well as in the iPhone, iPad and Android apps.

How to play Deduce Daily

  1. Open Today's puzzle on deducedaily.com or in the app.
  2. Read which game it is today and its rules, shown beside the board.
  3. Work through the puzzle by deduction; there are no hints on the daily.
  4. Use Check to see whether you have gone wrong.
  5. Finish before midnight UTC to keep your streak, then try the other games at any difficulty.

Screenshots

Deduce Daily's home screen with Today's puzzle, a hard Killer Sudoku, above the Nonogram card
A Deduce Daily Ice Maze board with blocks, a ball and a star goal

Tips

  • Read the strategy notes beside the board before starting a game type you rarely play.
  • Practise the day's game at Medium first if it is new to you; the daily is always hard.
  • In Killer Sudoku, total each row, column or box against its cages: 45 minus the cage sums gives the missing cell.
  • Note that the day turns at midnight UTC, which is evening in the Americas.

Questions

Is the Deduce Daily puzzle the same for everyone?

Yes. One hard puzzle a day, the same board for everyone until midnight UTC.

When does it reset?

At midnight UTC.

Are there hints on the daily?

No. The daily has no hints and cannot be re-dealt; the other games have hints.

Is it free? Do I need an account?

It is free to play on the web and in the apps, with no account or sign-up.

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