Awesome Challenges A curated list of algorithmic challenges websites. - Advent of Code (https://adventofcode.com) - CareerCup (https://www.careercup.com/page) - CheckiO (http://www.checkio.org/) - CodeCombat (https://codecombat.com/) - CodeFights (https://codefights.com/) - Codeforces (https://codeforces.com/) - CodeHunt (https://www.codehunt.com/) - Codewars (http://www.codewars.com/) - Codility (https://codility.com/programmers/challenges/) - Coding Mystery (https://codingmystery.com/) - CodinGame (https://www.codingame.com/start) - CSSBattle (https://cssbattle.dev/) - exercism.io (http://exercism.io/) - Free Code Camp (https://www.freecodecamp.com/) - HackerRank (https://www.hackerrank.com/) - Interview Cake (https://interviewcake.com/) - InterviewBit (https://www.interviewbit.com/) - Kattis (https://open.kattis.com/) - LeetCode (https://leetcode.com/) - Project Euler (https://projecteuler.net/) - ROSALIND (http://rosalind.info/) - Screeps (https://screeps.com/) - smarterer (http://smarterer.com/tests/categories/Programming) - SoloLearn (https://sololearn.com) - TheHuxley (https://www.thehuxley.com/) - topcoder (https://www.topcoder.com/challenges/) - URI Online Judge (https://www.urionlinejudge.com.br/judge/en/login) License Based on bayadin/awesome-awesomeness (https://github.com/bayandin/awesome-awesomeness) repository. !Creative Commons License (http://i.creativecommons.org/l/by/4.0/88x31.png) (http://creativecommons.org/licenses/by/4.0/) This work is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/). challenges Github: https://github.com/mauriciovieira/awesome-challenges