'Was there a specific game that got you into game dev?'

Was there ever a game that gave you a "this is it!" moment about game development -- the one that pushed you on the path? We asked our Twitter followers this question: "Was there a specific game that got you into game dev? 'This is it!' What was it & why?" The result is a wide array of different games: Some recent, some older; some obscure, some regarded as era-defining classics. Some inspired their creators thanks to the quality of the game -- and some inspired them thanks to the qualities of the game. In other words, some were simply inspired by the total package; others found something within that pushed them to explore that space in their own work. What's the game that did it for you? Feel free to share it in the comments below. Remember, if you're interested in participating in these conversations in the future, make sure to follow @Gamasutra on Twitter. The questions usually go out on Fridays in the late morning, Pacific time, alongside Tweets of our regular news, blogs, and original writing.