Coding challenges in various languages with ranking scoreboard, experience levels and voting on solutions. Many of the challenges tend toward mathematics, so may require some background research before solving them.
Tackling a challenge
Many of the challenges have only a very basic explanation, so always review the sample unit tests to help with the understanding. The sample tests are not necessarily the full suite of tests run when testing your solution, so there may be undocumented edge cases to solve
The source and test code can be copied into a new project, as has been done with the practicalli/codewars-guides solutions
clojure -M:new lib practicalli/readability-is-king
The ATTEMPT button will run all the unit tests for the challenge, which may be more than the sample tests. If the attempt passes all the tests then the solution can be submitted an other solutions reviewed.