Word Reactor — Vocabulary Game
Race the reactor while discovering, practising, and mastering useful English vocabulary.
- 2 subjects: mathematics (Grade 1 to university year 3) and physics (Grade 1 to university year 2).
- 9 free books, 342 chapters, every exercise solved.
- 344 chapters readable online in English, French, Dutch, Spanish, Portuguese, Hindi, Arabic and Indonesian — free, no account.
- 3 free learning games: mental math, vocabulary, and world geography.
- Open source: the books are written in LaTeX and developed openly on GitHub. Free forever, no ads.