Logic Grid
About hard logic grids
Same board as medium — four categories, five items — but with several clues taken away: 11 to 18 where medium gets 15 to 17. The step here is thinking, not size. With less handed to you, you cannot hold the full state in your head; you need to trust the marks you have made and work systematically.
Multi-step elimination chains define this level. A single new mark can trigger a cascade: an elimination forces a hidden single, which propagates to a different sub-grid, which creates another hidden single. These chains are satisfying when they fire, and catching them is the core skill to develop here.
Conditional chains get deeper too. You might need to link three clues together before any of them become actionable: "the tea drinker plays soccer," "the soccer player lives in Paris," and "the person in Paris drives a BMW." Connecting these before you know who drinks tea lets you build a profile that eliminates candidates.
Solid performance here means you're ready for expert — five categories and ten sub-grids. The techniques are the same, but the scale and the interconnection between sub-grids increase significantly.
How to play Logic Grid
- Each block pairs two lists. Every row and every column in it gets exactly one ✓.
- A ✓ rules out the rest of its row and column — mark those ✗.
- So when only one cell in a line is still empty, it answers itself.
- Work the clues in any order, and come back to them: a clue you cannot use yet often opens up later.
- Easy pairs three lists, later tiers four and five, and Einstein adds clues about who sits next to whom.
- Every puzzle has one solution, reachable by logic alone — never by guessing.