Go up the stairs and into the castle-like structure. At the entrance is a Save/Switch point and to the right of it is Kain's Lance.

Going forward, you will come to a circular stair. To the left of the stair you can challenge the Master Phantom.

Continue on until you come to a room with windows and arches. At the top level, go down to the small platform to find The Tower.

The next room has a long, curving bridge. Halfway across, you will have to fight Malaris.

In the next room, you will watch a reenactment of the destruction of Alexandria. Afterward, step forward to find a Save/Switch point and the Angel Flute.

Continue up a circular stair. In the room after, you can challenge the Defense Phantom on the left of the landing.

When you reach the stairway with an eye at the top, go to the left and pick up the Rune Claws. Once you ascend you'll fight Tiamat.

Afterward, continue on up the stairs until you come down a flight and around a corner. In the corner you can challenge the Strong Phantom.

Go onwards, up the stairs that twist around horizontally. Beyond is a Save/Switch point.

The next room seems to be underwater. To the right, behind the rock, you can fight Hades if you wish.

After the underwater room, you'll come to a room with a pool. As you ascend you'll have to fight Kraken.

Beyond is a room with a broken clock. At the bottom there's a Save/Switch point. At the top, you can challenge the Rare Phantom.

In the next room, a giant ball of fire hangs behind a ladder. Climb the ladder to the platform. Search the left side for the Mace of Zeus. You can challenge the Dark Phantom on the right.

After entering the room, it will change and you'll have to fight Lich.

After the battle, check the left side of the room for a Save/Switch point. Step out into space and after wandering for a while you'll enter the Crystal World.