LeetCode is described as 'platform for learning and improving coding skills with the goal of being fully prepared for programming interviews. Choose problems to solve from categories such as System Design, Algorithms and Database, join code contests and engage in mock interviews' and is an website in the Development category. There are more than 25 alternatives to LeetCode, not only websites but also apps for a variety of platforms, including Windows, Mac, SaaS and Linux. The best alternative is Khan Academy, which is free. Other great sites and apps similar to LeetCode are Codecademy (Freemium), exercism (Free, Open Source), HackerRank (Free Personal) and Codewars (Freemium).
When learning to code, most people get stuck on the "bridge" between memorizing syntax and understanding the logic that makes it all work. We believe the most effective way to learn a programming language is to break the process into three phases:
Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
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Project Euler vs LeetCode opinions
pros, cons and recent comments
There is a mathematical focus and has good examples of why some problems need optimized algorithms. You get exposed to a lot of cool math concepts and are challenged to write in efficient time and space complexity.
Screeps is a massive multiplayer online real-time strategy game. Each player can create his or her own colony in a single persistent world shared by all the players. Such a colony can mine resources, build units, conquer territory.