Final Fantasy VII/Mako Reactor no. 5

Back in Sector 7, you will meet a lot of scared people. Head to the bar — the building on left where Barret is waiting.

Inside, you meet Tifa Lockhart for the first time in this game. If you bought flowers from Aeris, you can give them to her or to the little girl, Arlene. Talk to the folks there. If you try to get out, Barret will come in and get the meeting downstairs going. You can ask Tifa to make you a drink if you like.

Downstairs, you'll get to talk more to the AVALANCHE folks and see exactly how cold Cloud is. As you try to get out of the house, Barret will give you your pay, which you spend most of to buy armor, weapons and materia for Barret and the others. You also sign up for the next mission.

In the morning, after greeting Barret and Tifa, who will now accompany you for a while, Barret asks how to use Materia. Choose to explain if you want to see a tutorial on the Materia system. You can now use the Materia menu to arrange your stuff.

Outside, there are a few places to visit. You can talk to people, and visit houses. You also have some money to spare now, so you can visit the weapon shop and the materia shop. Pick up as much Materia as you think is necessary, but don't buy too much, as you will find most of the useful materia later on. You might also want some protective stuff like Iron Bangles, Potions, and maybe even an extra Phoenix Down.

Barret hinted that the weapons store guy knows something. Talk to the guy behind the fence and he sends you upstairs. Beginner's Hall has a cute dog, and a lot of helpful tutorials to get you familiar with all of the basic aspects of the game. There's also a Save Point there. Here, you can also pick up a free All materia, which you should equip immediately. Pair it with Restore so you can heal your entire party.

Reactor no. 5
Once you're done, head up and to the right from the town the way you came in, and head back to the train station. The train is waiting, so hop aboard. Inside, talk to folks again. Tifa wants to show you the security monitor again, but something goes wrong, and the security lockdown starts. You now have 15 seconds to head out of each car — just follow where the rest of the group are running again. Although you will have to move very fast, if you quickly speak to the man in the back right corner of the first car, you will receive a Phoenix Down. Next, in the second train car, speak to the man at the top left to receive a Hi Potion. In the next car, you will be pick pocketed, but if you catch up to him and speak to him, you will recover your stolen goods. Eventually you'll reach the last car, and you get to jump out of the train.

Once outside, there's really not much else to do but go up to a security gate. Examine the air conditioning duct, and head down. What follows is a simple maze-like portion. You don't have people running ahead of you to guide you, but whatever route you take, you'll finally end up to the crawlway leading to the reactor and a save point. Along the way, you'll meet Jessie and Wedge, and at least find an Ether, Potion and a Tent, which is right beside the save point.

Once you get to the duct and emerge on the reactor side, you've got to slide to get down. Reactor no. 5's inner building is exactly same as the no. 1 Reactor, so this should be familiar territory. Head to the reactor core room again, plant the bomb, and Cloud gets another flashback, although there isn't a boss fight here. To get out, head back the same way you exited the first reactor, and go up the elevator.

Escaping the Reactor
The security room is different in this reactor. Tifa and Barret go to the other side of the table. Try to hit the button at the exact same moment as the others. It doesn't need to be exactly at the same time, just close enough. Head out, and there's a save point on the other side of the room. Save here, because you won't be getting to another save point until after the upcoming boss fight.

With the explosion, the bridge breaks and Cloud falls into a dream sequence after a short struggle.