Bebras International Informatics Competition
An international online competition in informatics and logic for grades 1-11 (ages 6+). Features 15 tasks on algorithmic thinking without requiring special preparation. Free.
Olympiads Free Online
An international online competition in informatics and logic for grades 1-11 (ages 6+). Features 15 tasks on algorithmic thinking without requiring special preparation. Free.
Olympiads Free Online