How to Solve a Logic Grid Puzzle
A logic grid is a small mystery with one answer. You use the clues to work out which items belong together, marking what is true and ruling out what cannot be true. You do not need outside knowledge or a lucky guess.
Start with the categories
Each puzzle introduces a few groups, such as people, keepsakes, and places. Each person matches exactly one item from each other group. If June has the shell, nobody else has it, and June cannot have another keepsake.
The grids show the possible pairings. A square where “June” meets “shell” represents the question: Did June bring the shell?
What do the marks mean?
- ✓ Yes: This pairing is confirmed.
- × No: The clues have ruled out this pairing.
- Blank: You have not determined the answer yet.
Tap a square to cycle through yes, no, and blank. When you confirm a match, Riddle Lamp rules out the other choices in that row and column.
Solve one clue at a time
Start with clues that state a match directly. In The Lighthouse Visit, one clue says, “June brought a shell.” Mark June and the shell ✓. That rules out the other keepsakes for June and the shell for the other visitors.
Next, look for clues that connect two categories. “The person with a journal visited the cove” links a keepsake to a place, even though it does not name the person. Mark that relationship in the keepsakes-and-places grid.
Now bring the clues together. Because June brought the shell, she did not bring the journal. The journal belongs to the person who visited the cove, so June did not visit the cove either. Mark that possibility × in the people-and-places grid. You have made a new deduction without guessing.
Let each grid help the others
After every confirmed match, check the other grids. A fact about a person and an item can tell you something about a place. An exclusion in one grid may leave only one possible choice in another.
If a row or column has just one blank square left, ask whether that must be the match. Then check that it agrees with every clue before marking it ✓.
Check your answer
A finished puzzle has one match in every row and column, and all the grids agree with one another. Read the clues once more, then choose Check my answer. If something does not fit, return to the last deduction you made rather than clearing the whole board.
If you are stuck, use Give me a hint for a nudge. You can also Reset to start again, Show solution when you are ready to see the answer, or Print puzzle to solve on paper.
Ready to try?
Start with The Lighthouse Visit, an easy three-person grid, or The Train Journey if you want another gentle board. Make the direct matches first, then let each new mark narrow the possibilities.
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