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"Olympiad counting puzzle" without complex numbers · 28 May 2022 · Maths

Fiscal fibrillations (18/02/22 Riddler Classic) · 22 February 2022

Robot Archery · 1 January 2022 · Problems Maths

Tricky triangles · 26 October 2021

Your evil DCDA twin (08/10/21 Riddler Classic) · 11 October 2021 · Problems Maths

Absolutely shook · 22 September 2021

Productive polygons (17/09/21 Riddler Classic) · 20 September 2021 · Problems Maths

Robot Tug-of-War · 1 September 2021 · Problems Maths

Radiodrome prodrome (27/08/21 Riddler Classic) · 30 August 2021 · Problems Maths