🧩 This logic grid puzzle is interactive right here on the page — click a cell to cycle it blank → ✓ → ✗ → blank as you work through the clues. Prefer paper? It also prints on a single page as a blank grid to fill in by hand, with a fold-over answer key at the bottom. Suitable for ages 10+ — no special knowledge needed, just careful deduction.
| Chemistry | Astronomy | Robotics | Botany | Geology | |
|---|---|---|---|---|---|
| Dara | |||||
| Iris | |||||
| Finn | |||||
| Sasha | |||||
| Nolan |
Every clue here rules something out rather than telling you the answer directly — that's normal for logic grid puzzles, and it's exactly what the grid is for.
Every clue here is a "not" statement — nothing is handed to you directly, and with five items instead of four you'll need to stack several negative clues on the same row before a cell locks in. That's what makes a 5×5 grid a genuine step up: each solved row unlocks the next, but you have to find the right row to start with. For the full method, see our complete logic puzzle solving guide.
The Science Fair is a 5×5 grid, built the same way as The Talent Show: each row has one fewer clue than the last, so the puzzle solves itself in a clean cascade — Dara first, then Iris, then Finn, then Sasha, until Nolan's project falls out by elimination alone. All ten clues are "not" statements, and each one is necessary — take any single clue away and more than one solution becomes possible.