Clues
How to Play
GoalUse the clues to match each item in every category to its correct partner. Mark what is true (✓) and eliminate what is false (✗) until the whole grid is resolved.
Controls- Click a cell to cycle its state: empty → ✗ (false) → ✓ (true).
- A click changes only the cell you clicked — the rest of its row and column is yours to rule out, one click at a time.
- The grid auto-validates and completes once every relationship is correctly filled.
DifficultyHigher difficulty adds more categories and more items to match, with subtler clues.
Tips- Read every clue before you start — note the direct ("A is B") and negative ("A is not B") facts.
- When you confirm one match, mark the rest of that row and column ✗ yourself.
- If a row has only one empty cell left, that cell must be the match.
- Use elimination: if four of five options are ✗, the fifth is ✓.
About Logic Grid Puzzle History, Strategy & Tips
A logic grid puzzle gives you a set of categories — for example, five people, their houses, pets, and favourite drinks — and a list of clues. Your task is to deduce which item in each category belongs to which, using a grid to mark what is true (✓) and eliminate what is false (✗).
These puzzles reward careful reading and systematic elimination over flashes of insight. Every clue is a lever; pull them in the right order and the whole grid resolves.
The History of Logic Grid Puzzle
Logic puzzles have a distinguished pedigree. In 1886 the mathematician and author Charles Lutwidge Dodgson — better known as Lewis Carroll, the writer of Alice’s Adventures in Wonderland — published The Game of Logic, a formal system for reasoning about “all” and “some” statements using a board and counters.
The modern grid format crystallised in the mid-twentieth century through puzzle magazines. The most famous example, the “Zebra puzzle” (often misattributed to Albert Einstein), asks the solver to determine who owns a fish from a set of clues about five houses. Whether or not Einstein had anything to do with it, the Zebra puzzle became the template for thousands of grid-based deduction puzzles that followed.
Solving Strategies
Read every clue before you start
Skim all the clues first. Note the direct facts (“Anna owns the cat”) and the negative facts (“The cat owner does not drink tea”). Having the full picture in mind helps you spot chains of deduction later.
Confirm, then eliminate
When you mark a cell true (✓), immediately cross out (✗) every other option in that row and column — if Anna owns the cat, then no one else does, and Anna owns no other pet. This “one true kills the row” rule is the engine of the puzzle.
Single empty cell = certain
If a row or column has only one empty cell left, that cell must be the match — mark it true. This cascading deduction often unlocks the next section of the grid.
Eliminate by exclusion
If four of five options in a category are marked false (✗), the fifth must be true (✓). Counting what is left is just as powerful as finding what is right.
Logic Grid Puzzle FAQ
Do I ever need to guess?
No. Every logic grid puzzle on this site can be solved entirely by deduction from the clues — never by guessing.
What do the checkmarks and crosses mean?
A tick (✓) marks a confirmed match; a cross (✗) marks an eliminated option. Click a cell to cycle between empty, false, and true.
How does difficulty change?
Higher difficulty adds more categories, more items per category, and subtler clues that require multi-step chains of deduction.
Does the grid tell me when I am done?
Yes — the grid auto-validates and completes once every relationship is correctly filled.