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Title	Difficulty	Tags
Chessboard rook placement combinatorics	Novice	combinatorics
Compound Z linear algebra	Beginner	linear algebra
Sequence Limit 1 analysis · limits	Novice	analysislimits
The Cooling Potion analysis · limits	Novice	analysislimits
The River Crossing analysis · integral	Beginner	analysisintegral
The Watchtower Courtyard geometry	Intermediate	geometry
In/Circumscribed Triangle geometry	Novice	geometry
The Angle Bisector Segment geometry	Novice	geometry
Midpoint Quadrilateral Area geometry	Novice	geometry
Modular Congruence 1 number theory	Novice	number theory
Garden Path Tiling combinatorics · recurrence	Intermediate	combinatoricsrecurrence
The Treasure Map number theory	Beginner	number theory
The Coded Message of Zephyr number theory	Novice	number theory
The Mysterious Repeating Decimal number theory · fermats little theorem	Intermediate	number theoryfermats little theorem
Irreducible Polynomial Mod p algebra	Intermediate	algebra
The Grand Librarian's Catalogue number theory	Novice	number theory
Calcora city linear algebra	Beginner	linear algebra
Cycling in the wind linear algebra	Beginner	linear algebra
Divisibility with LCM number theory	Intermediate	number theory
2 to 1 Arc geometry	Novice	geometry
Rotating Triangles geometry · algebra	Novice	geometryalgebra
The Center of a Cube geometry	Intermediate	geometry
Palindrome dates riddle	Novice	riddle
Distinct ways to win combinatorics	Beginner	combinatorics
Elevator levels riddle	Beginner	riddle
Walk on grid combinatorics	Novice	combinatorics
Maximum Product with Fixed Sum No tags	Beginner	—
Equal Preimage Halves set theory · combinatorics	Novice	set theorycombinatorics
Telescoping series induction · telescoping sum	Novice	inductiontelescoping sum
The dictionary nobody asked for combinatorics	Beginner	combinatorics