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Codewars - Codewars is a collective effort by its users. They are creators - authoring kata to teach various techniques, solving kata with solutions that enlighten others, and commenting with constructive feedback.
Project Euler - Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
Practicing Ruby - Delightful lessons for dedicated programmers
Rubeque - Solving ruby koans and problems from easy to deadly hard
Ruby Warrior - Learn Ruby through a triumphant quest of adventure, love & destiny
Coding Mystery - Coding Mystery sends you on a journey of escape-room-inspired mysteries full of coding puzzles, programming challenges, and problem-solving.
CodinGame - CodinGame is a challenge-based training platform for programmers where you can play with the hottest programming topics
Ruby Quiz - Ruby Quiz is a programming challenge for Ruby programmers in the spirit of the Perl Quiz of the Week
About
A list of sites with challenges to improve your programming skills