What is Griductive?
Griductive is a deduction puzzle that places twenty people on a four-by-five grid, each secretly criminal or innocent. A single arrangement satisfies all statements on the board. The game refuses unproven verdicts: you must demonstrate your reasoning before the board accepts a call. Each correct verdict flips the card green for innocent or red for criminal and reveals the statement that person carried. Some cards start flipped to provide an entry point.
How to play Griductive
Tap a character and mark them criminal or innocent. If you are right, the card flips to show their statement. If you are wrong, you get feedback and the case continues.
Tap a resolved card to focus on its statement. The board dims, and the people mentioned in the statement are highlighted. Long-press to close it.
Tap Mark to add pencil notes. The dot cycles through red and green for hypotheses, followed by three neutral shades for grouping.
Use Hint in two stages. The first outlines the statement you need. The second identifies the person you can name next.
Why the forced-proof rule matters
A board that rejects unproven moves makes the game enforce the discipline deduction requires. An error gives you information instead of simply penalizing you. Each correct verdict flips a card and reveals a new statement, so the grid records your progress as you solve. Spotlighting a statement handles the marking that logic grids typically require on paper in one gesture: it darkens the board and colors only the people that sentence concerns.
Reading feedback and using color
Two colors mark the verdict: green means innocent and red means criminal. The color appears as soon as your call is validated. Hints are colored only on the statement you select. A hue directs your attention; it does not show the board’s verdict. An error does not end the game. It tells you what went wrong. The board verifies your calls, making “are you allowed to say that?” central to the game alongside “are you right?”
Modes and structure
La grille du jour releases a new case at midnight Eastern Time each day. Cases become harder from Monday through the weekend. La semaine displays seven numbered dots above the board, from MON EASY to SUN HARD. The game also includes a guide with a glossary, a strategy page, and an archive, all available during play.
Tips for solving
Don’t lock onto one person. At least one verdict is already forced by the board. Look for the person the clues have settled, even if you have not noticed it yet.
After each card you flip, reread every statement. A new card usually unlocks a clue somewhere other than the line you were just reading.
If nothing is forced, check whether you have widened a word’s meaning: reading “next to” as “near,” or “exactly” as “at least.”
Some flipped cards provide only character lines. The useful statements refer to neighbors, rows, or columns.
The glossary defines the grid before you need it. Rows are counted from the top, columns are labeled from the left, and C2 means column C, row 2. Check it again when a grid seems unsolvable.
Common questions
Can you guess? No. The board accepts only a verdict supported by the clues. A wrong call gives feedback without ending the game.
Does griductive.com redirect? Yes. The old address redirects to knotwise.games/games/griductive at Knotwise Games. It is the same game, with the same board and guide.
What happens when you are wrong? Nothing irreversible. You get feedback, but the case stays open, so you can commit only to what the clues prove.
What does the Hint button do? It works in two stages. First, it circles the statement you need. Then it points to the person you can name.