HackerRank is described as 'A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges' and is a Code Learning service in the development category. There are more than 50 alternatives to HackerRank, not only websites but also apps for a variety of platforms, including SaaS, Windows, Mac and Linux apps. The best HackerRank alternative is exercism, which is both free and Open Source. Other great sites and apps similar to HackerRank are LeetCode, tutorialspoint, Codewars and CodinGame.
VIM Adventures is an online game based on VIM's keyboard shortcuts (commands, motions and operators). It's the "Zelda meets text editing" game. It's a puzzle game for practicing and memorizing VIM commands (good old VI is also covered, of course).
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