One of my favorite corners of Tamagotchi are the games that were released alongside the toys! They were spread over a wide variety of home consoles and usually had at least one twist on the pet raising mechanics, some more experimental than others. They're also what I've collected the most of when it comes to Tamagotchi ^.^ I own a good few physical copies of them! (including games from later in the series too)
There's also quite a lot of computer software for Tamagotchi! that part is still under construction though teehee
The pages on the games aren't exactly guides but are more of an overview and personal thoughts, but if you want to read in depth guides NeoMametchi is a great source!
