Five friends won a weekend hackathon with a study-planner app. Each of them had exactly one role. Use the clues to work out who did what.
Read a clue. Put ✓ for yes and ✗ for no in the grid.
One ✓ in a row means ✗ for the rest of that row and column.
When every person has a role, check your answer against every clue.
Designer
Coder
Pitcher
Tester
Researcher
Amara
Diego
Hana
Ravi
Sam
Sam has never written a line of code.
The pitcher rehearsed the demo once each with Hana, Ravi and Sam.
Ravi is neither the tester nor the researcher.
Ravi sketched every screen on paper before the coder built it.
Amara is not the designer, the pitcher or the researcher.
Sam did not do the research.
Turn the page upside down to read the hint.
Hint: Start with Ravi: clues 2, 3 and 4 leave him only one role.
My reasoning: which clue settled each role?
Talk it over
Why it matters: Logic grids train the habit of using only what is given and ruling options out step by step: the same discipline as debugging code or checking an argument.
Which clue unlocked the rest?
How do you know there is no second answer?
Extend it: Write a 4 × 4 mystery for someone else, and test that only one answer works.