Introduction
The game begins with Tidus at his house. Approach the two girls for an autograph request. A group of kids will then ask you to teach them how to Blitz. Once finished, head down the long roadway toward the stadium.
After the cutscene, go down the ramp and approach the man in red - Auron. Follow him.
Sinscale Battles
You’ll face Sinscales, small flying enemies encountered during the escape. They are defeated in one hit. Only target the enemies directly in front of your party, as those behind you cannot be attacked.
Boss: Sinspawn Ammes
After clearing a few waves of Sinscales, you'll face your first boss: Sinspawn Ammes. This fight teaches you about Overdrives - FFX's version of Limit Breaks.
After defeating Sinspawn Ammes, head towards the blue sphere and interact with it. This Save Sphere allows you to create a save file as well as restore all HP and MP. You'll come across these throughout the game so make use of them when you see them.
Tanker Battle
Continue forward and you'll hit more Sinscales. They spawn endlessly during this sequence, so don't bother killing them all. Watch for Sinscales whose wings flicker—that means they're charging an attack. Target those first.
When Auron shouts to focus on the "Tanker," shift both characters to the large mechanical target. The Tanker's anchor line has 1,000 HP; five hits destroys it and ends the fight. Ignore the Sinscales entirely once Auron gives the command.
After the battle, float down towards the man to end the chapter.