# Mathematical Notes * Catriona Agg's Puzzles * [[About the Solutions to Catriona Agg's Puzzles]] * Puzzles by year: [[Catriona Agg's puzzles 2026|2026]], [[Catriona Agg's puzzles 2025|2025]], [[Catriona Agg's puzzles 2023|2023]], [[Catriona Agg's puzzles 2022|2022]], [[Catriona Agg's puzzles 2021|2021]], [[Catriona Agg's puzzles 2020|2020]], [[Catriona Agg's puzzles 2019|2019]], [[Catriona Agg's puzzles 2018|2018]] * [[Catriona Agg's puzzles|Full List]] in reverse chronological order * [[Puzzle Gallery]] consisting of thumbnails of all the puzzles * [[Puzzles by Topic]] classifies the puzzles by the techniques needed to solve them. * Topics in Mathematics (that are used in the solutions to the puzzles) * [[Geometry Topics]] * [[Number Topics]] * [[Algebra Topics]] * [[Misconceptions]]