This puzzle asks you to find the single category linking five clues: Factory, Inside agent, Introduce subtly, as an idea, Tree or shrub, and Put seeds in the ground. The answer is Different definitions of “plant”. The clues look unrelated on the surface but share one precise category. Read all five before guessing — the link should feel natural on every row. With only "Factory", many categories could fit. Hold your first guess and watch what clue 2 eliminates. "Factory" and "Inside agent" must share one repeatable link — not a coincidence between two words. By clue 3 ("Introduce subtly, as an idea"), "Different definitions of “plant”" should explain all three without bending meanings. "Tree or shrub" strengthens "Different definitions of “plant”" rather than opening a new theory. The final clue ("Put seeds in the ground") confirms "Different definitions of “plant”" — if it still fits naturally, the category is locked. Use the Solution tab above for an interactive clue-by-clue walkthrough, or the Solved board tab for the complete answer at a glance.