Play Logic Grid Puzzles Online

How to Play Logic Grid

Modes: Easy · Medium · Hard · Daily

Logic Grid is a deduction puzzle: read a set of clues and work out exactly which value of every category belongs to which person.

Each person has exactly one value from every category, and every category value is used exactly once across all people.

Tap a square to mark it with a check (this person has this value), tap again to cross it out (this person does not have this value), and tap a third time to clear it.

Marking a check automatically crosses out the other values in that category for the same person, and the same value for everyone else.

Rules

Every person gets exactly one value from each category.

Each category’s values are all used exactly once — no two people share the same value.

The solution is the unique full assignment that matches every clue.

Scoring

History & Origins of Logic Grid

Logic grids belong to a durable family of table-based deduction puzzles that twentieth-century puzzle magazines and books helped systematise. The formula is simple and long-lived: a small cast of people, several categories of attributes, and a list of written clues that link the two until checks and crosses finish the picture.

Their most famous ancestor is the zebra-style riddle that circulated from the 1960s under the banner of Albert Einstein — real or not — carrying a boast that 98 percent of people could not solve it. That notoriety taught a generation that patient elimination beats raw cleverness.

ThinkyPlay renders the genre as a tidy interactive grid: tap a square to check that a person has a value, tap again to cross the possibility out. Every puzzle is solver-verified to hold exactly one answer, and the cast grows from three people on Easy to five on Hard.

Common Mistakes to Avoid

• Checking a value but not acting on the crosses it triggers — a check instantly crosses out that person’s other options and the same value for everyone else, and those new crosses are usually where the next deduction hides.
• Filling only checks and never crosses. Without crosses you cannot see when a value has only one legal home left, which is exactly when the grid wants you to check it.
• Assuming two people can hold the same value. Every value in a category is used exactly once, so the moment one person is checked for it, nobody else may have it.
• Checking a square from a guess rather than a clue. Wrong checks are not flagged while you play, so one careless assumption can quietly poison the rest of your grid.
• Skipping the position and ’next to’ clues. Those order clues anchor the rows and are often the fastest way to force a placement, while attribute-only clues can leave the layout ambiguous for a long time.

Tips & Strategy

Start with the most direct clues: a clue that matches a person to a value locks both immediately.

Work each category column one value at a time — if only one person can hold a value, check it and cross out the rest.

Use crosses aggressively: “does not” clues and order clues like “next to” eliminate options fast.

Re-read clues after each deduction — a new lock usually unlocks another.

Use the Hint button when stuck — it checks a square that logic already determines.

Frequently Asked Questions

Is Logic Grid free to play?

Yes — Logic Grid on ThinkyPlay is completely free, with no download and no sign-up.

What is a Logic Grid puzzle?

It is a deduction puzzle where you match values from several categories to people using written clues — like the classic Einstein riddle.

Can I play Logic Grid on my phone?

Yes — tap squares to check or cross them out. It works on desktop, tablet and mobile.

Are all Logic Grids solvable?

Yes — every puzzle on ThinkyPlay has exactly one solution, verified by our solver before it appears.

What is the difference between Easy, Medium and Hard?

The cast grows: Easy lines up three people across a couple of attribute categories, Medium uses four, and Hard five, with more categories, more clues and longer chains of deduction as you climb.

Is there a daily Logic Grid?

Yes. The Daily Logic Grid gives every player the same Medium puzzle each day, so you can compare your solve time with friends who played the identical board.

Why does a square cycle through three states?

Check means this person has the value, cross means they do not, and blank means undecided. Keeping undecided squares truly blank stops you from assuming a match before the clues prove it.