After the scene you will have a chance to switch your party member. At the [Downhill Path] you will notice a Girl. Basically you need to follow her but you can do so after getting all the treasure chests along the way. Keep chasing the Girl until you reach the [Tree base] where you can speak with her. Go to the [Stairway] and take the north exit for a scene.
You will control Zidane at the [Gate]. Re-form your party and take the right path. Go to the [Storage] and examine the large pot to free Moorock. Speak with him to accept his letter. Leave and re-enter the [Storage] to find Stiltzkin. Buy a set of Diamond, Ether and Elixir for 2, 222 Gil from him. Go to the west [Storage] for a scene. Next, head to the [Laboratory] and speak with the Girl. Follow her to the [Meeting Hall] to continue with the story.
When you control Eiko you will get a few ATE to view. The ATE are actually telling you where Vivi, Quina and Amarant are and at the same time where Zidane is heading. Speak with the three party members to have them join Eiko then head to where Zidane left. Speak with the Girl there to switch the scene to Zidane.
When you control Zidane go to the next screen for a few scenes with the old man. You will have to keep chasing after Garland to continue the conversation. Afterwards you will control a brainwashed Zidane and with a few upcoming mini-boss battles. You will fight three foes consecutively make sure you defeat them. If you get a game over you will be back to where you last save.
Your first battle is against an Amdusias with Zidane alone. Freya will join after the first turn and Amarant after 2 turns.
With these two on your side you can win easily. Your second battle will be against an Abandon starting with Steiner and Quina. Zidane will join after two turns making the fight easier. Your last battle will be against a Shell Dragon. Dagger will join when the mini-boss has executed smash on you. With a healer you can’t possibly lose.
After the last battle return to the where you fought the Amdusias. Moorock at the first [Hall] will switch your party members. Make your way to the [Generator]. Press the button in this area to have the bulbs light randomly. The point is to avoid passing near the bulbs that are emitting light. Otherwise you will have a random battle after which you need to press the button again. There are many ways to get out of here; try to move and stay far from the bulbs whose light are on. If you do it properly a bridge will from in the next screen. You also need to cross the bridge before the 30 seconds are up else Zidane will run back to the [Generator]. When you reach the [Control Room] examine the switch and increase the Standard Heading to 3. Go the [Elevator] and ride the life twice upwards to get chest no. 2. Return to the [Control Room] and set the Standard Heading to 4. Take the lift twice again at the [Elevator] to reach the top floor. At the top floor path A and B (map) will both lead to chest no. 3 and 4. Take path C to reach Mozme. Save and give her letter. Equip everyone with Locomotion for a series of boss battles is ahead. When you are ready take the east exit.
Abilities such as Auto-Haste, Auto-Regen, Half MP will make the battle easier. It doesn’t matter who is on your party. As long as you have a healer and a damage dealer you will win. Silver Dragon has two abilities of concern; Twister and Shockwave. Curaga will cover all damages or you can simply rely on Auto-Regen. Defeat Silver Dragon to start the second battle.
Your previous battle statuses will carry over this one so heal if you have to. If you are not confident about your abilities and levels then drop a tent on Garland or use Quina Bad Breath. If you have equipped everyone with Locomotion then you will be safe from getting stopped Flare and Psychokinesis can do decent damages otherwise there’s nothing to worry about. Once you have defeated Garland the third battle will start.
Kuja has nearly the same amount of HP as Garland. His magic; Demi, Thundaga and Flare can hurt a little but your healer can cover the damages. To damage him the most use your physical attacks or abilities such as Frog Drop/ Shock. Once you have damaged Kuja enough he will go into trance and use Ultima to wipe out your entire party; similar to what Beatrix used to do to your party before.
After the battles you will control Zidane at the [Outer Path]. Go to the bottom to create a new path. Cross the [Bridge] for a scene at the exit. Use the teleporter near Dagger to wrap back at [Bran Bal]. At the [Hilltop] backtrack into town for a scene. Afterwards you will get the option to save your game and insert the last Disk.