Retro Game Mechanics Explained

This is part 2 of the first Q&A session! This half contains questions more about games and mechanics.

The SNES has a processor that is dedicated to producing audio. How does it interface with the main CPU? It's all explained right here.

Did you know most published SNES games have ROM metadata stored inside them? It's all explained right here.

How does MissingNo. end up looking like the way it does? And how exactly are Pokémon sprites displayed on the screen? It's all explained right here.

Last time I said I wanted to fix all the glitch Pokémon sprites. How exactly, and how did I do it? It's all explained right here.

How can so many Pokémon sprites fit in such a small game, and how exactly is all that data compressed? It's all explained right here.

How can NES games create parallax background effects if the console only supports one background layer? It's all explained right here.

What can happen when a game's variables get out of control and the system is put into an inconsistent state? It's all explained right here.

How do the character sprites in Super Mario Bros. 2 have 5 colors? It's all explained right here.