Not a test · a new puzzle every day

One logic puzzle a day. No guessing. Just thinking.

One real puzzle a day. No guessing, no answer key. You'll end up thinking better without noticing you practised.

Play today's Yukti

Free. No sign-up. About five minutes on weekdays, longer at the weekend.

Getting today's puzzle ready.

How it works

A nudge, not an answer

Most puzzle apps either let you brute-force it or hand you the solution. Yukti does neither.

  1. Every move must be certain

    The board blocks moves that break a rule and tells you which rule. You can't stumble into a solution; you reason your way there.

  2. Stuck? Get asked a question

    A nudge asks “who's left behind if you do that?”, never “move the goat”. Three per puzzle, and they never count against your score.

  3. Share the shape, not the spoiler

    Your result grid shows how you solved it without revealing the moves. Compare routes with friends.

The nudge

When you're stuck, Yukti asks instead of tells

The first nudge asks about the rule you're about to bump into. The second narrows it down. Only the third names a step. Most people never need the third.

Puzzles

A different kind of thinking every day

River crossings, liars and truth-tellers, logic grids, a table seen from every chair. Every move has to be a real deduction. Gentle early in the week, tougher by the weekend.

  • Crossings

    Kind of thinking: Planning

    Get everyone to the other side without leaving an unsafe pair alone, or overloading the boat.

    Shows up as: a river, a lift

    Origin Problems to Sharpen the Young, attributed to Alcuin of York, about 800.

    Read the guide

  • Liars and truth-tellers

    Kind of thinking: Deduction

    Truth-tellers, liars, and what their statements give away.

    Shows up as: knights and knaves, robots

    Origin Raymond Smullyan's What Is the Name of This Book?, 1978.

    Read the guide

  • Logic grids

    Kind of thinking: Deduction

    Who did what, from a handful of clues.

    Shows up as: a plain grid, the spirit's riddle

    Origin The Zebra Puzzle, 1962. The spirit's riddle: the Vetala Panchavimshati / वेतालपञ्चविंशति, “twenty-five tales of the spirit”, about the 11th century.

    Read the guide

  • Sound or fallacy

    Kind of thinking: Argument

    Short arguments. Say which ones hold, and what breaks the rest.

    Shows up as: places and signs, the village

    Origin Nyaya / न्याय, “method”: India's classical logic, from the Nyaya Sutras.

    Read the guide

  • The counting duel

    Kind of thinking: Planning

    Take turns adding to a count, or taking stones. Plan ahead to make the last move.

    Shows up as: a duel of numbers, a riverbank game

    Origin The duel of numbers between Ashtavakra / अष्टावक्र and Bandi / बन्दी, in the Mahabharata.

    Read the guide

  • Anekanta

    Kind of thinking: Perspective

    Points of view: set a table so what each person says about their view is true. Left and right depend on where they sit.

    Shows up as: a table seen from every chair, Maya's hall of illusions

    Origin The blind men and the elephant, in the Buddhist Udana, and the Jain idea of anekantavada / अनेकान्तवाद, many-sidedness.

    Read the guide

Every solve counts toward something

One vault a month, opened by everyone

Each day you solve today's Yukti, you earn a part for the vault's locks and a private clue. When the vault opens, a very tough puzzle waits behind it, different every month. Not a test.

  1. Earn a part and a clue

    Solve today's Yukti. Free, with no sign-up.

  2. Open the locks together

    Attached parts show up for everyone. Each lock has a hidden rule to work out.

  3. Solve what's behind the vault

    Your clues help.

See this month's vault

Questions

What is Yukti?

Yukti is a free daily logic puzzle at playyukti.com. Everyone gets the same puzzle each day, and every move has to be a certain deduction, so you never need to guess.

Do I need an account?

No. Your streak and stats stay in your browser, and a backup code in Settings lets you move them to another device. You can earn parts and clues without one too. You only need an email to put your name on the scores.

What is the Big Yukti?

One shared puzzle a month. Each solve of today's Yukti earns a part for a vault's locks and a private clue. When the vault opens, a very tough puzzle waits behind it.

What is a nudge?

A question that points you at the rule you're missing. You get three per puzzle, and they never count against your score.

Will Yukti make me smarter?

We don't claim that. Yukti gives you one real reasoning puzzle a day and asks good questions when you're stuck. What you do with the habit is yours.

What if I miss a day?

One missed day in a week keeps your streak going. Free players can also play the last 7 days from the archive.

When does the new puzzle arrive?

At midnight where you are. Everyone plays the same puzzle on their own calendar date.