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#2 LeetCode
Extensive library of algorithmic problems, mock interviews, and contests; supports multiple languages and detailed solution discussions.
#3 HackerRank
Skill‑based coding assessments, interview preparation kits, and domain‑specific tracks (e.g., AI, DBMS, security).
#4 Codeforces
Competitive programming platform with regular contests, problem archives, and a vibrant community for rating and discussion.
#5 AtCoder
Japanese‑origin contest site offering weekly contests, a clean problem set, and high‑quality editorial solutions.
#6 TopCoder
One of the oldest competitive programming sites; hosts Single Round Matches (SRMs), Marathon matches, and a talent marketplace.
#7 Exercism
Mentor‑driven platform with language‑specific exercises; provides automated feedback and community reviews.
#8 CodeSignal
Gamified coding assessments, interview practice, and a universal coding score (CS) for benchmarking.
#9 CodinGame
Learn to code by solving puzzles that produce visual games; supports many languages and multiplayer challenges.
#10 Edabit
Beginner‑friendly bite‑size challenges that unlock as you progress; focuses on rapid skill acquisition.
#11 Project Euler
Mathematics‑oriented problem set encouraging algorithmic thinking; ideal for honing problem‑solving skills.
#12 CodeChef
Large Indian coding community offering monthly contests, practice problems, and a robust discussion forum.
#13 Coderbyte
Curated challenges with built‑in editor, solution videos, and interview‑focused tracks.
#14 InterviewBit
Interview‑oriented problem set with a structured learning path and mock interview simulations.
#15 HackerEarth
Practice problems, hackathons, and hiring challenges; supports a wide range of programming languages.
Huge archive of algorithmic problems; includes classic contests and community‑submitted challenges.
#17 CodeAbbey
Simple, straightforward problems with immediate feedback; great for beginners.
Data‑science focused micro‑competitions and notebooks; offers hands‑on coding tasks for analytics and ML.
#19 CodeCombat
Game‑based learning platform where you write code to control characters; targets younger learners and beginners.
#20 CheckiO
Puzzle‑driven platform with a visual map of challenges; encourages creative solutions and community sharing.
#21 CodinGame Clash
Multiplayer coding battles that combine algorithmic problems with real‑time strategy gameplay.