While I never had this, there are a series of games that my brother and I, (and later my school) used to learn similar concepts! https://colobot.info/. - Source: Hacker News / 7 months ago

Not a Steam game, but an amazing programming puzzle game that I keep looking for a modern version of. Year: 2001 Title: Colobot Link: https://colobot.info/ My description: Use code to direct wheeled, hover and flying bots to construct, combat and explore. Description: Colobot (Colonize with Bots) is an educational, post apocalyptic real-time strategy video game featuring 3D graphics, created by Swiss developer... - Source: Hacker News / 8 months ago

Oh if you look for programming, try Colobot , it is now 20 years old... Source: about 1 year ago

Well, you program it in java like language with proper syntax. https://colobot.info/. Source: over 1 year ago

Did you get Colobot Gold Edition? Available here : https://colobot.info/. Source: almost 2 years ago

UPDATE 8/22/2011: found http://jshint.com, it looks much better than http://jslint.com/. Source: about 2 years ago

Use https://jslint.com to find the unescaped quote or whatever that's invalidating the file. Remember to put quote marks in dialogue as \". Source: over 2 years ago

Ooh! I'm pretty sure I actually know this one! I watched a bunch of Douglas Crockford talk's at Yahoo! Talking about the weirdness of the language he helped develop (such as this one). He also has built JSLint to help pull out code that runs but can have unexpected results. Booleans in JS evaluate if something is truthy or falsy and undefined is falsy (19:20), however a string of "undefined" would be truthy, and... Source: over 2 years ago

For future, just pop your code into an HTML Validator, a JS Linter, or a CSS Linter and it will check for basic stuff like this. There are also plugins in most IDEs for these kind of things which are incredibly useful. Source: about 3 years ago