← The Logic Grid · Lesson 2 of 3
Mark what cannot be
Most clues tell you what is not true. "Ana does not have the cat" is a cross in Ana's cat box. Crosses are most of the work.
When you place a tick, cross out the rest of that row and column at once. That is often what unlocks the next step.
You put a tick for Ben and the dog. What should you do straight away?
A lesson is kept once you've answered the question and written at least 8 words. Nobody grades it; it stays on this device.