Yeah, the hard bit was the IDEs weren't as nice. You didn't have the Internet to look up the syntax of some function when you needed it. No Stack Overflow. No ChatGPT. No-one else's code to look at to see how they solved it.

Even something as simple as "what is the algorithm to determine which isometric tile the user is clicking on in 2D/3D space" had to be solved from scratch :(