Follow this comprehensive walkthrough for Tails' adventure in Sonic Adventure, covering all stages, boss fights, and key events from start to finish.
Tails is flying in his airplane when, suddenly, the engine fails, and he crashes into a beach. When he gets his bearings, he looks up to see Sonic. Sonic asked him what happened, and Tails tells him that he was trying to use a Chaos Emerald to power the plane. He just needs to work on a few bugs. Tails then tells Sonic to come to his workshop in the Mystic Ruins to see something he has been working on.
When you gain control of Tails, go through the hotel to the train station and hop a train to the Mystic Ruins. Go to the right and up the stairs next to the hill; at the top, Tails and Sonic will have a confrontation with Eggman. Eggman brags about having a new evil plan, and then tells Tails to hand over the emerald. Of course, Tails refuses. Tails then engages in a battle with Eggman.
Boss: Egg Hornet
Hits to Defeat: 3
Difficulty: Easy
Just wait until the Egg Hornet digs, and then hit the cockpit. As long as you make sure you always have at least one ring, you'll be fine.
After the battle, it looks like Eggman is defeated, but he manages to steal the Chaos Emerald from Tails nonetheless. He then calls Chaos 0 and feeds him the Emerald. Apparently, Chaos grows stronger every time he eats an emerald. Eggman then reveals his plan to destroy Station Square and in its place build "Robotnikland". He then runs off with Chaos to find more emeralds. Sonic and Tails, being the heroes that they are, vow to find the Emeralds before Eggman does.
Go up the stairs, and then grab the crystal in front of Tails' Workshop. Go down the steps, and then go straight foreword, to where there is a lake. On the right, you'll find a cave. Enter, and then put the crystal on the pedestal. Go into the gusts of wind to enter stage one, Windy Valley.
Once you complete it, head back to Station Square. Go to the Casino Area, and run down to the end of the street. Fly up and press the button on front of the casino; this will open the door to the second stage, Casinopolis.
After you get the emerald, Sonic and Tails will return to Station Square. Eggman, of course, chooses this time to show up. He gasses Sonic and Tails, and then makes off with the Chaos Emerald. Tails decides that they need to work even harder if they plan to foil Eggman.
Now, a short cutscene will show a crystal appearing in an ally. You will find this ally in the Casino area, almost directly across the street from the steps leading to the train station. Take the crystal, and then go back to the Mystic Ruins. A cinema scene will show a cliff exploding, revealing another cave. Enter, and run into the gust of wind to be transported to a tunnel. Run forward, and to your right, you should see a pedestal. Put the crystal on it, and then go in the door and up the path to enter stage three, Ice Cap.
Upon completion, go back out of the tunnel and head to the left side of the lake. Knuckles will be there, and he will attack Tails, demanding him to hand over his Chaos Emeralds. Tails will have no choice but to fight Knuckles.
Mini-Boss: Knuckles
Hits to Defeat: 3
Difficulty: Easy
Like the Egg Hornet, very simple. Wait until he stops attacking, and then hit him from the back or the side. Three hits and you've won.
When you beat him, Eggman will show up, and steal your two Chaos Emeralds. He comments that it's like taking candy from a baby, and then he feeds the emeralds to Chaos. Sonic gets mad at Knuckles for letting Eggman get the emeralds, but before much can happen, Eggman sets the monster known as Chaos 4 on Tails.
Boss: Chaos 4
Hits to Defeat: 5
Difficulty: Easy/Medium
Chaos 4 is tougher than the previous bosses where, but he's still pretty easy. You fight him in a lake, scattered with huge lily pads. All you have to do is jump around and avoid his attacks, and then hit him when he surfaces. You can stand on the water, but don't stay in the same place too long or you'll sink and lose rings.
A huge ship flies across the sky; Eggman introduces it as the Egg Carrier, and then he flies off. Sonic and tails talk about how they need to catch him, but Knuckles says he can't help, as he has some unfinished business to take care of. Sonic says that's fine, and that he and Tails will deal with things.
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