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There's no shortcut to mastery. Following Casey's will get you half way there, much more so than the many quick "tutorials" you'll find elsewhere.

On the contrary, the market is flooded with quick, easy tutorials with the (sometimes implied) disclaimer that it's not production ready. To have just a single example of the opposite is wonderful.

It's definitely not overkill, it's probably one of the biggest free gifts to programmers I'm aware of. That said it would be a full time job for me for a year to get through it. I wish it had been available when I was a teenager and seemed to have infinite time on my hands.

Yes, you do have to be willing to spend thousands of hours to become that kind of game programmer.