Vim Adventures is described as '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)' and is an website in the Education & Reference category. There are more than 10 alternatives to Vim Adventures, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and iPhone. The best alternative is exercism, which is both free and Open Source. Other great sites and apps similar to Vim Adventures are Codewars (Freemium), HackerRank (Free Personal), CodinGame (Free) and CheckIO (Free, Open Source).
CodeCombat is an online game that teaches programming to learners as young as 6. Students write code in real programming languages. No experience required! - How much does it cost? There are 110+ FREE levels which cover every concept.
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.
CodeSignal is the leading provider of assessments for technical hires. As the creator of the Predictive Coding Score, a measure of a candidates coding skills, CodeSignal provides HR teams with Certified Assessments, Custom Tests, and Live Interviews.
CSSBattle is an online CSS Code Golfing battleground. Here, players from all around the world try to visually replicate "Targets" in smallest possible CSS code and battle it out to get to the top of the leaderboard. Are You Game?