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How to Solve Logic Puzzles: Grid, Zebra and Tents
Logic Grid, Zebra Puzzle, Tents and similar puzzles all share one spine: a small number of categories, a one-to-one rule, and clues that let you cross out impossibilities until one assignment survives.
1. Understand the table
Every person or object takes exactly one value from every category, and each value is used once. That means the finished grid is a set of “yes” squares with exactly one yes per row, per column and per category.
2. Anchor the absolute clues
Start with the blunt statements — “Alice is in position 1” or “the red house is on the far left.” These position anchors pin the whole arrangement and stop the puzzle from sliding sideways. Mark every square those facts imply before reading on.
3. Cross out everything a clue rules out
Take each clue twice: once for what it forbids and once for what it allows. “Ben does not drink tea” crosses out one square directly. “Ben drinks coffee” crosses out every other drink for Ben and coffee for every other person. These ripples are the real progress.
4. Chase the forced yes
A cell is a yes when every alternative in its row or column has been crossed out. When a yes appears, immediately cross out the rest of that row, that column and that category value. Then look at what new cells that leaves as the only option. Momentum is everything.
5. Use the pencil-less grid marks
ThinkyPlay grids give you three states per cell — unchecked, checked (yes) and crossed (no). Always mark crosses explicitly. A board full of blank cells hides progress; a board with crosses everywhere shows you exactly what is still possible.
6. When deduction stalls
Re-read the clues in a different order and look for statements about relative positions (next to, to the left of) — they only bite once you have fixed some order. Hard puzzles hide their most powerful clue near the bottom of the list.