Sonic Advance is a Sonic game released on Gameboy Advance. That's why Sega decided to call it Sonic Advance.
Ahem.
So, since it is a Sonic game (on Gameboy Advance), this TAS is about Amy.
...
And she has a hammer!
Seriously, if you want good info about the game, you'd better use wikipedia or something.

Playing as that pink hedgehog can make the experience really different compared to the 3 other characters. The main cause is her lack of typical Sonic-type moves, but she has her own unique moveset (very hammer-centric) along with related useful tricks. First, Amy Rose can't turn into a ball at the player's will, unlike Sonic, Tails, Knuckles and Samus. Her jumps by themselves are not attacks either, again unlike Sonic, Luigi, Knuckles and...No, not Samus, she needs the screw attack and that doesn't count. The answer to "how do I attack, then?" is obviously to use Amy's piko piko hammer, but let's just see in detail what she can do.

-pressing A does the basic jump, it can be adjusted in height by holding the button longer.
-Amy's 2nd jump is a high and fast one, done using Down + B on the ground. For some reason she seems to use the hammer to perform it. For some other reason, while in the air after this jump, it's impossible to use any other move. The jumping height is non-negotiable.
-to do a short hop, press Down + A when she's on the ground. Its main function is to gain speed faster, let's call it the poor man's spindash; but it has other uses, and a derived move: by pressing B while hopping, Amy trips (yeah, in the air) in order to wipe the floor with her face. Don't laugh, this is an attack move! The only problem is the recovery time...
-speaking of (real) attack moves, B is the hammer. On the ground it kills Amy's movement and has a big recovery time too; pressing B again starts another hit after the first one that makes Amy move forward a little and have a better reach. Hey, that is a combo! Particularly useful to know since all normal enemies die in one hit. In the air, the hammer is a nice attack in an arc in front of the player, it can be used to bounce once on an enemy or a breakable object, too.
-last but not least, there is the... Hum, whirlwind attack (let's name it like that). It's Down + B in the air. A special attack that can be used to bounce indefinitely on enemies or other breakable stuff like bosses, for example. It has so many uses that it will have a dedicated paragraph in the tricks section.

A special note concerning all the hammer attacks: They can be used to hit bumpers, making them more effective (they give a bigger boost) and allowing Amy to use them from some distance thanks to the hammer's reach. There are still times when it's better to let the hammer stay in her pocket (or wherever she hides it) and use a bumper the normal way, though.

There is a little trick at the beginning of the game that allows the player/TASer to skip the "Created by Sonic Team" screen. A simple soft reset (A+B+Start+Select) at the right time and that's it.

This technique has so many little uses that it's almost unfair for the other moves. See above to know how to do it. Its basic function is to attack and to be able to bounce on things, like with a regular jump from the other characters, but there is more. The most interesting point is one specific property of that move: when performed, it immediately stops all horizontal movement (it puts the X speed back to zero), and Amy can start accelerating by going left or right instantly too. It is like having a portable wall that can be pulled out of thin air at will. The simplest application is to change direction sharply or adjust speed more precisely. Here is an example of a more advanced use of it: when taking a diagonal bumper, by doing that whirlwind attack right after the collision, Amy literally transforms that bumper into a normal, vertical one. And it leads to new and fun shortcuts.

Maybe the only true glitch of the run, and it's done twice. When approaching some elements of the scenery, if Amy has the right speed, the right position and the right amount of faith in the Glitch God, jumping at the right frame makes the collision detection go nuts and puts her a little under the ground (under the object used to clip through the floor).

Some bosses have different patterns that are chosen randomly, while other bosses are nice and just act as totally predictable robots. To manipulate the randomness of a boss, the time at which the player encounters him plays a role... But before losing frames to have the desired pattern, there is another factor that can be used without sacrificing time. When the character skids (or trips *evil laugh*), the shoes (or face ^^) create little dust clouds; each time a cloud appears, it influences the future randomness.

Or the joy of hex editing and redoing whole chunks of some levels. At the beginning of each act, there is the classic screen that indicates the name of the level. At this point, it's possible to start the action whenever we want by pressing any button, or we can just wait a little for it to start by itself. First thing: when it starts (pressing a button or waiting too long), the timer starts too, so there is only a real time malus if we delay it, the ingame time is safe. Second thing: As soon as the screen appears (act name, etc...), all the moving objects that happen to be present in that level start their routine. That includes moving platforms, moving bumpers, retracting spikes... Everything that is not an enemy, it seems. So here is the conclusion, it's possible to pick the state in which all those moving things will be by delaying the beginning of an act. The only problem is that they can't be changed individually, creating some sad moments: "yeah, that platform was out of the way, and these ones were right where I wanted to, just a little rush to the en..." *gets impaled by rising spikes* (it happened, for real).

The beginning with the loops is all about building speed before the long flat part. Passing under that frog near the end was special, it didn't work at first, but using the hammer apparently changed Amy's hitbox just enough to make it.

This time, the end is where we can build a lot of speed, every downward slope that has a good enough angle is a potential speed builder with a well timed jump. Easy boss, easy go, let's free those animals!

Those horizontal cables where Amy spins around have strange characteristics; it appears that the vertical speed Amy has when grabbing one influences the (horizontal) speed she'll have on it.

We have proof that Amy can be very fast with her hammer, by hitting two bumpers in succession. This technique, almost too fast to be visible by an untrained eye comes from a piko piko-fu master. Or not. Another boss, not too hard but he always does a high jump after four hits taken, and he stays up there for a long time. Defeating him before that jump is apparently not possible with Amy, but it was sooo close :(. We have to endure that waiting time in the end...

Those casino levels are quite mean when it comes to delaying the start in order to tame all the moving parts. Now that this is done, enjoy the first clip through the floor. A pretty big time saver.

That boss gave us trouble, it's the first random boss and arguably the worst because of the number of possibilities (only 2 patterns are optimal, and he has a lot of them). Killing him after having finished the luck manipulation was a pleasure.

Riding on a frozen rail, a lot of whirlwind attacks for good movement, water, falling faster than a big ice block. That's the story of this act. Many real time frames (more than a second) were lost just for fun at the end, sorry.

Again, quite a lot of hammer action here. The boss has some randomness, but it's never in the way (there is no "bad pattern"), so let's play with the stalactites. He has a very long invulnerability time after each hit.

That was not easy, but there is nothing extremely noteworthy. A lot of very small tricks were used, one of them was about a brown, hum, screw thing and some weird collision detection, if you wanted an example.

There is a very visible use of the "diagonal bumper to whirlwind attack" trick in this level. It permits to go over that bumper and take a better route. The optimal time to hit the boss is when he prepares a spindash attack, it makes him land 2 to 3 frames sooner compared to hitting him when he's just standing. Since his invulnerability frames timer only starts when he has landed, you get the idea. Sadly he uses randomness against Amy, and there is little time to skid (luck manipulation) between attacks, he was hit while standing at one point, not counting the first hit, of course.

Horrible level... It has been redone a lot of times, urg. That's where we discovered the diagonal bumper + whirlwind potential. The jump to reach the first bumper where it is used needed to be frame perfect, and the hammer barely reaches it, too. What happened between the 2nd "whirlwinded bumper" and the breakable wall was particularly technical (not that the rest of the run isn't ^^') and hard to pull out, you'd better enjoy it :p
The other highlight of the act is the clipping through the floor using one of those tube things, whole seconds are saved thanks to it. You can also notice a strange visual glitch if you know the game well (it happens at least once in other levels): when doing a high jump as soon as Amy lands on a moving platform, with the right conditions it looks like a normal jump, but without the starting animation.

Changing gravity, yeah! (it can happen in Egg Rocket but that was skipped by a shortcut...) There is a little corner boost on the 2nd bumper encountered, saving a whole... Hum, 4 pixels maybe? There are 2 close calls with retracting spikes, one of them was responsible for some big headaches and reTASing the whole level with a margin of 4 or 5 frames (to get behind the spikes in time) after changing the starting time of the act. That boss was quite annoying too, he can't be flipped when hugging a wall and is immune to the standing hammer attack. Why? Just because.

Just 3 bosses in a row, and two of them are jokes. For the first and 3rd ones, doing the right jump at the right moment makes them appear sooner because of the camera movement. It's almost a glitch. Anyway, that last boss is one of the random guys, hopefully it was quite easy to get his best pattern. The movie file could have ended earlier by using the whirlwind attack to bounce on him, but it sacrificed ingame time; so that's it, we just have to watch Amy jump and land unharmed on a plane... The End.

It was indeed both a pain and a pleasure working on this run with Grincevent. The aforementioned pain coming from the run itself along with other issues, including from my last submission... but that is for another story! I was starting this alone on behalf of those that were looking to see a TAS with Amy as well as a '100%', when it was revealed that my attempt was not good enough after seeing VanillaCoke's early WIP... I then asked to work on it with him and while he didn't do much else aside from Neo Green Hill Zone, he has taught a few things as well. Eventually, Grincevent and I began working on this run together as VanillaCoke's NGHZ work was also being improved on. We both learned a great amount of things as work was being done (with me learning more than anything). At the same time, the sting from the previous submission lingered in my mind and heart so I had stopped focusing on the run and lost motivation momentarily. When my focus returned to the run, I looked back and at my solo attempts and wondered what did I need to do to truly appeal to the masses while producing results... I only came up with a whatever-it-takes method.
Regardless of that, it was fun and I hope that you all enjoy!

My main task was being an "optimizer", so I didn't do a lot of route planning, except when I've suspected a possible better path by looking closely at the maps of the levels or when applying some new knowledge to create a shortcut. To use a metaphor, the drawing was already done (thanks to GoddessMaria and VanillaCoke), then I launched Gimp (Photoshop is not free and I'm poor) to apply some smoothing and change a couple of details. It means that the game was TASed at least twice to end up like it is now. But some acts have been redone more than that due to the discovery of new useful tricks, for example. Discovering little by little all the possibilities that the whirlwind attack offered was really fun, even if it caused me to redo Egg Rocket entirely for one new shortcut, ouch... It sounds like I was working alone after the others, but there was a lot of cooperation all the way to the end: I in fact started to search for improvements on earlier acts while GoddessMaria was doing the middle to end game, then sometimes we worked on the same boss at the same time to find solutions (boss manipulation and some strategy testing), or I remember asking her to (re)do a trick in the optimized version that I couldn't replicate despite all my efforts ^^. I didn't meet VanillaCoke at all on this project, I was too late to the party, but I'm sure I would have learned some tricks from him. Did I mention I enjoyed being part of this project? Have a good time watching it :)

-Zeupar for being the special Sonic consultant and helping with various things
-TerraEsperZ for having made the maps that were of a great help for this run
-All the speedrunners from The Sonic Center, or at least the ones that have good times or videos to give a good feeling for the routes to use ^^
-La bande à Bicou (ouh, ouh!) - this one is from Grincevent, don't pay attention
-And Claude François

feos: Accepting to Moons and publishing...