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Recommended coding challenge websites?

Recommended and mentioned products

  1. Achieve code mastery through challenge.

  2. Learn to Code in 90 Days or Less

    paid Free Trial $120.0 / Annually

    I like the competitiveness in edabit
  3. Project Euler is a series of challenging mathematical/computer programming problems that will...

    I did some challanges.
  4. CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.