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An anagram word game with hints, editable word lists and unlimited attempts.

A letter-guessing word game with topic categories and difficulty levels.

Dynamically generated maths worksheets covering arithmetic, algebra and other school topics.

A supplemental maths programme built around visual puzzles and animated feedback.

Cybersecurity courses and labs across professional roles.

Short Chinese videos with a guided study schedule.

Practical words and phrases with native-speaker recordings.

Competitive-exam preparation offered through online, classroom and hybrid programmes.

Illustrated medical learning with schedules and review tools.

Video courses on search marketing and Ahrefs tools.

Clinical learning for pediatric healthcare professionals.

Open online courses from Spain's UNED.

Official PTE preparation routes for Academic, Core and Home tests.

IELTS practice and lessons with writing samples, vocabulary exercises and a speaking simulator.

Elementary science units organised around topics such as weather, life cycles, materials and forces.

Contest problems with automatic solution judging

Ethereum development through practical coding challenges

Learn Ruby by correcting ordered test-based exercises

Study software design by rebuilding familiar tools in Python

A written introduction to JavaScript and browser-console work

A systems textbook with interactive learning resources

Chemical reference data with documented data collections

An interactive periodic table with property and isotope views

Fish reference lookup by common or scientific name