Rules & Themes The 9th YCCC 2025 is open to the U23 generation (born 2002 or later), matching the age limit for juniors in the WFCC solving competitions (WCSC, ECSC, ISC). This year YCCC has one section with strict thematic condition (A – #2) and two sections without set themes (B … Continue reading 9th YCCC 2025 launched Continue reading