Deduction — Daily deduction puzzle
A free daily logic grid puzzle. Light or darken every window using clues that are all true - solvable by pure elimination, one answer, no guessing. No account.
How to Play Deduction
Deduction is a daily logic grid puzzle. The board is a grid of windows - 5 across and 4 down on the daily - and every window finishes either lit or dark. Nothing starts filled in; what you get is a list of about twelve clues, all of them true and all of them visible from the start. They talk about counts along a row or column, about a window’s eight neighbours, about two windows matching or differing, and about what lies further along a line. Together they leave exactly one possible grid, and that grid is always reachable by elimination alone - both properties are proven by separate checks before the board is served, so you never have to guess. Tap a window to light it, again to darken it, a third time to leave it undecided. A clue greys out once it has nothing left to teach you. Free, no account, and the same board worldwide.
How Deduction works
Deduction is a logic grid puzzle - the family that contains the zebra puzzle and Einstein’s riddle. The board is a grid of windows, 5 across and 4 down on the daily, and each one finishes either lit or dark. Nothing is filled in when you start.
What you are given instead is the clue list beside the board. Every clue is true, and every clue is visible from the first second - there is no progressive reveal. A clue talks about counts ("row 3 has exactly 2 lit windows"), about neighbours, about one window relative to another, or about what lies along a row or column in a given direction.
Those clues together pin down exactly one grid. That is proven twice before a board is served, by two checks that share no code: one walks the clues one at a time to confirm the answer is reachable by elimination alone, the other searches the whole space to confirm no second grid fits. So you never have to guess and back out - there is always a window somewhere that one clue on its own decides.
Input is a three-state tap: undecided, lit, dark, undecided again. A clue greys out the moment no possible completion of the grid could break it, which is the puzzle telling you it has nothing left to give. A clue turns red when the grid already contradicts it.
The daily board is the same for every player in the world. A daily clue carries nothing but whole numbers and grid coordinates - no names, no objects - so it survives translation into every language we ship without the puzzle changing. Your solve time goes to the global leaderboard, and Deduction Unlimited generates fresh boards on demand without touching your streak.
Tips & Strategy
Exactly one clue states a single window’s state outright, and every puzzle has one. If you are staring at a blank grid wondering where to begin, that is where.
Walk each counting clue asking how many lit windows it still owes. A clue owing zero decides every remaining window in its set as dark; a clue owing as many as it has undecided windows decides them all as lit.
"Row 1 has more lit windows than row 4" is worth more than it looks: it means row 4 cannot be full and row 1 cannot be empty, before you know a single window in either.
Greyed clues cannot help you again. When you are stuck, reading only the black ones typically cuts the list you are scanning in half.
Tapping a clue pins it to the top of the list. On a twelve-clue board the two clues that interact with the region you are working on are worth keeping in view.
When a clue flags red, the contradiction is a fact about the grid, not about the window you just tapped. The real mistake is usually two or three decisions earlier - undo rather than building on it.
More Game Modes
One word per day. 6 guesses. The classic.
2 boards, 1 keyboard, 7 guesses.
4 boards, 1 keyboard, 9 guesses.
8 boards, 1 keyboard, 13 guesses.
16 boards, 1 keyboard, 21 guesses.
32 boards, 1 keyboard, 37 guesses.
Race the clock. Solve as many words as you can before time runs out.
Navigate meaning space. 30 guesses.
Find the mystery country. 6 guesses on a paper globe.
Guess the daily math equation in 6 tries.
Find every word hidden in seven letters. New puzzle daily.
Swap the 21 tiles so every row and column spells a word. 15 swaps, par 10.
Trace hidden theme words on a 6×8 grid. New puzzle daily.
Trace adjacent letters to find every word in the grid.
Crown each region — one queen per row, column, and colored area.
A chess puzzle a day. Drag your moves, submit when ready, learn from the colours.
Lay every domino so each outlined region satisfies its rule.
Fill a 6x6 grid with suns and moons — balanced lines, never three in a row.
Draw one line through every cell — numbers in order, walls in the way.
Split the 6x6 grid into rectangles — one clue in each, matching its shape and size.
Name the country from its flag. 6 guesses, one tile at a time.
Fill a 6x6 grid so every row, column and 2x3 box holds 1 to 6 once.
Trace four hidden words through a 5x5 grid
Name the country from its shape alone. 6 guesses.
Name the countries that link two places by land.
Turn one word into another, changing a single letter at a time.
Spell your way around the box and use all twelve letters.
The day’s letters, jumbled. Put the word back together in six tries.
Sixteen words, four hidden groups. Find what connects them.
A five by five crossword in your own language, every day.
Play in 90+ Languages
Every language is free. No account needed.
Why Wordle Global
From Arabic to Yoruba. The largest multilingual Wordle.
Learn the meaning of every word after you play. Expand your vocabulary.
Every word comes with a custom illustration. Collect them all.
Light, dark, and high-contrast modes for comfortable play.
PWA — install on any device. Works offline. No download needed.
No account required. No paywall. Just play.