Daily logic puzzle
One clean reasoning puzzle, every day.
Start with a compact deduction challenge, lock your answer, then see how current AI models handled the same problem.
Featured challenge · Logic · 4 min
Launch Lineup
Four people, Ana, Bo, Cy, and Di, must stand in a line.
- Ana is not first or last.
- Bo stands immediately before Cy.
- Di stands before Ana.
Which lineup must be the only valid one?
Pick an answer to start the timer. The model comparison appears only after you lock in.
Share this daily logic puzzleWhy it works
Built for people who like crisp constraints.
The challenge format rewards careful reading, possibility checking, and the small moment where the whole problem clicks into place.
Fresh daily prompt with a stable share link
Answer choices are visible immediately
Model comparison only appears after you commit
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