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That would be closing the circle. Back in the 1970's some video games were more or less purely implemented in hardware (e.g. I believe Pong was originally implemented with discrete TTL chips, and a later hone version was implemented in a single VLSI chip).

That's right. All of the early arcade games used TTL discrete logic.

The first arcade game implemented with a microprocessor was released in 1975

https://en.wikipedia.org/wiki/Gun_Fight

You are very close to truth. Before, many games implemented using chips, but not all chips was logic, some things was analog.

Even in consoles/arcades, loong later appear some hybrid things. For example, I hear about one arcade which was based on z80, but have analog sprite scale unit.

I think, nearly completely digital world become only after appeared Nvidia TNT, which was cheap enough and produced in huge numbers.

But to be honest, I don't have enough info about hardware used in Nokia NGage and other portables, so I could assume, even later hardware could have analog parts.

This is a softcore running a Quake port. Cool, but not quite what you want.

You are not alone. I also wonder, when most old classic games become hardware :)