The Emeralds Quest Browser Game

The Emeralds Quest​

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Hello, everyone! I'd like to present a game, which turned out to be quite unique in some way. I like Sonic and puzzles very much, and I've always wanted to make a game about him. But I'm not very good with programming and hacking, but I've learnt PHP, MySQL and other web-developing stuff, so I've got an idea once about making a game using the skills I'm at least a little bit good at. I started working on this project three years ago. Everything was written from scratch in the notepad++. The game went through a lot of hardpships on its way, but I finally finished some time ago it. 

My wife wrote all the code and I, Razor, made the images she described. I'd like to make a reminder here as not one of us is a good artist. And we didn't have any time, since the coding, the ideas and the writing (in both Russian and English language) were on us. So I just googled and edited the pictures we found on the Internet. Only sometimes we drew something ourselves. So if there turns out to be anyone, who sees their art and wants it to be taken down or credited in some way, please, contact me immediately, and we'll fix it.
My wife tried her best to translate the game to English, but she might've messed something up. If you'd care to point and fix some mistakes in her English, she'd be very grateful if you do so.
Now, about the game itself. It's actually like some kind of an interactive fanfic. There are games, which require some thinking. Everyone's puzzles will be a bit different thanks to a randomizer. So telling a person in need of help to press some particular buttons won't do any good, because it works differently for everyone. The only way to solve some of these puzzles, is to figure out the concept of each particular one. Once you get the concept, it's going to be quite easy to figure out what to do with any kind of state of things.
Everyone is very welcome to try and deduce things together, but I'd rather you to post things you know how to solve inside a spoiler. If you are really stuck and want my help, I'll happily send you hints via PM.

Also there might be some minor problems with the site of the game, because I'm using a free hosting, and it has some troublesome restrictions and is a bit slow sometimes. Too bad, but I can't do anything about it. Also if you stumble upon any bug, please, send me a screenshot of it. I'll be very grateful.
This project took a lot of effort, and I'm unbelievably happy to finally have it finished after three long years and with so many thousands of rows of the code written.
I'll be very happy, if there are people, who'd find this game interesting.
Thanks for your time and attention! 

Here's a walkthrough with comments. If you are really stuck, you can see how to proceed in this video:

 

Interesting stuff, R&Z.

 

If the host I'm using (Floorchan) doesn't shut down, I'd happily host it for you. Only problem is that the domain will be www.floorchan.org/users/~ultimathehawke . Will that be okay? (Also, don't bother going there, there's nothing there. )