The classic pencil puzzle. A few friends each have a different pet, drink a different drink and play a different sport — and a short list of clues tells you just enough to work out who has what.
Use the grid to keep track. Put a cross where a clue rules something out, and a tick when you know for sure. Because nobody shares, a tick means everyone else in that column gets a cross; and when a row has only one blank left, that blank must be the tick.
Clues like “the cat owner drinks tea” link two categories through the people, and they are where the real detective work happens. Every puzzle can be solved by logic alone.
Use clues and a grid of ticks and crosses to work out which person has which item in every category.
The full guide, with a worked example and common mistakes: How to play Logic Grid.
Yes — the puzzle is solved when every person has the right tick in each block.
No — extra clues are removed, so every clue is needed.
Yes — the clues are checked so that logic alone gives exactly one answer.