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A game theory problem between Alice and Bob involving a

table filled with plus and minus signs, where they take turns crossing out rows and columns. A game theory problem between Alice and Bob

You can find the official papers, including specific versions for different grade levels and difficulty settings, on the Official Tournament of Towns website and the University of Toronto's mirror site . Basic Variant: October 5, 2025

The competition is split into two main seasons, each offering a "Basic" (easier) and a "Senior/Advanced" (harder) paper. Basic Variant: October 5, 2025. Advanced Variant: October 19, 2025. Spring Round (2026): Basic Variant: March 1, 2026. Advanced Variant: March 15, 2026. Final Oral Round: March 29, 2026. Sample Problems from the 47th Tournament Advanced Variant: March 15, 2026

A problem involving a 60-digit number made of ones and eights, requiring a proof of divisibility by a 30-digit number consisting only of nines.