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CodeAbbey - Programming problems to practice and learn for beginners
Tynker - Game Worlds for Kids to Learn Programming
Coderbyte - Coderbyte is a place built for anyone to practice and perfect their programming skills.
CodeCombat - Learn programming with a multiplayer live coding strategy game.
Codewars - Achieve code mastery through challenge.
StackHive - Design, develop or publish websites right from your browser