This Sidequest is based on the Original Game Tower of Druaga and is 60 Floors long and have some unique Treasures for you to grab. Most of the content is the same or very similar to the original. For example, Floor 25 and 55 having no Treasure is the same as in the Original. To gain entrance to the Tower of Druaga, you need 3 special Rods:
GC Rod (Cloudius, missable)
RC Rod (Swordian R&D Lab)
BC Rod (Harmentz)
Place the 3 Rods on these Pedestals.
2 of the Rods can be gotten anytimes without problems, but the one in Clodius can be missed if you forgot to get it and fought against Hugo, then you can never enter the Tower of Druaga and miss many good Stuffs. To get the BC Rod you need to get the Old Cane you gave at the begin of the Game to Watt in Harmentz and use one Rune Bottle or Philia Skill "Identify" to transform it into BC Rod. Once you've got all 3 Rods, then go to the Temple in Janos where Rutee was confined. If you have Mary in your Party, then she will introduce you to the Tower. Place all 3 Rods on the Pedestal and the Gate to the Tower will open and a mountain of Treasure await you including stronger Monsters.
The Monsters here don't drop Gald, Lens or even items only Experience. There is only one exception though. Except for some Monsters (like both Bossses and the Dragons) all Monster Party always have 4 Monster like 4 Green Slimes in 1 Green Slime Party, 4 Black Slimes in 1 Black Slime Party, etc.
Climbing up the 60 Floors high Tower of Druaga.
If you enter the Tower and exit the Tower in the middle without beating the Tower, then it's possible that some Treasure won't be there until you beat the Tower. Let take Floor 07 as a example. You got E. Bullet there and threw it away for the R. Doll. You then exit on Floor 59, because you think you're too weak for the Boss. After you reenter the Tower again you will find out the E. Bullet on Floor 07 disappear completely from the Floor, even though you don't have 15 E. Bullets in your Inventary. You beat the Tower and reenter it for the Third time to get the Second Round Treasures. The E. Bullet is back again and you trade it for a Channeling.
Another thing about the Tower is that the Floor change every time you enter the Tower, but the amout of Monsters walking around is always the same. Once you have solved the Puzzle on the Floor, then the Chest usually will appear on the Spot where you first appeared on the Floor.
Once the World is dipped in total Darkness, some People in the entire World will give you Hints to how to solve some Puzzle. Those Hints are in different color. One Hint for example can be found in Castle Darilsheid. F## mean the number of the Floor the hint is for.
Hints:
F07
"If you wish to meet the new goddess, bid farewell to the old goddess."
You got (meet) E.Bullet and threw (bid farewell) it away.
F11
"10 seconds at the bottom and then go up."
Easy to understand. You have to wait 10 seconds and then go north.
F16
"Destroy the knight of the mirror and seek the left wall."
You need to kill the Mirror Knight and touch the West Wall.
F17
"Don't exterminate the ghosts with the lanterns."
Leave the Mage Ghosts alone and kill the other Monsters.
F21
"Count to 10 when you are there. When you stop, count to 10."
Wait 10 second on one Spot then move to another and wait another 10 seconds.
F23
"Don't leave this place until you meet someone."
You will fight (meet) some Monsters.
F26
"Get the key and then walk into the wizard within 30 seconds"
Take the Key and meet the Wizard in the timelimit.
F27
"10 walls block the path."
Destroy 10 Walls which block the way.
F33
"If you want protection, your health should be at 1/10."
The HP should be at 10% to get the Shield (Protection).
F37
"It's possible to destroy the wall only when the correct path is cleared."
Get the Key and open the Door to clear the Path, after destroy one Wall.
F38
"Fight the blue flame continuously."
Fight 2 Blue Will O'Wisp one after another.
F48
"Go to all four corners and count to 10 at each corner"
Wait 10 seconds at each corner.
F52
"Vertical is your only obstacle"
Destroy all Vertical Walls to receive the Treasure.
Legend:
Chest
With a few exception there is one Treasure on every Floor which can be revealed if you do something. If you already have 15 of a item (for example 15 Life Bottle), then the Chest won't show up, even if you have fulfilled the requirements for it to reveal it.
Key
The Key is needed to open the Door somewhere on this Floor.
Door
The Door hinder you to going on the next Floor, so you need the Key to open the Door to give way to the Stairs that is behind it.
Stairs
The Stairs leads to the next higher Floor. You can't go back down, so you can only go higher. You can exist the Tower with the Wing Boots that is found on the First Floor.
Monsters
Unlike the Random Encounter in the Game the Monsters here are visible, so you can avoid them.
Green
The Background color insiate that the Treasure can be grabbed every times you get on this Floor.
Blue
The Treasure can be grabbed only once and be replaced by another Treasure next time you climb the Tower.
Red
The Treasure is only there, if you gotten the first Treasure in the First Run and beaten the Tower. Otherwise the Treasure won't be there and you'll only get a Green Gel in most case. The Treasure is there just once too.
Go in Southeastern Corner and face south for 10 seconds. If you aborted the Tower by using Winged Boots after collecting Strengthen, then you will only get a Green Gel upon reentering until you beat the Tower. Only then will the Tech Ring appear.
Check the Door with before taking the Key. After that kill every Monsters on the Floor. If you aborted the Tower by using Winged Boots after collecting Red Shield, then you will only get a Green Gel upon reentering until you beat the Tower. Only then will the Moon Sword appear.
Don't fight the Mirror Knight. Instead touch the West and East Wall once. The Order don't matter. By touching you go to the Wall and then go away from it. Walking along the Wall don't count.
Hellfire
Kill the Mirror Knight and touch the West Wall. The Order don't matter. By touching you go to the Wall and then go away from it. Walking along the Wall don't count.
First fight the Quox, then take the Key and open the Door, but don't use the Stairs yet. You can also take the Key first before fighting the Quox, but you can't open the Door before fighting the Quox.
Wait 10 seconds at the starting point, then move some steps away and wait again 10 seconds. Many have problems with this Floor Puzzle. So fight first with the Wizard Ghost, because they will often come to you. If there are many Monsters nearby, then fight it out. Then return to starting point and wait there and move some steps away and wait again.
Wait at the starting point until a Monster come to you. If none come to you after some time, then you can break Walls and lure the Monster to the starting point. Just make sure the Fight is done on the starting point.
You have to fight 3 Monsters on the startingpoint you appear on this Floor. If no Monsters come after you, then you can break Walls to make way for the Monsters to come to you. Lure them to the startingpoint.
Fight the Silver Dragon, but if Stahn have less than 10% of his HP, then the Chest with Blue Shield / Green Gel will appear.
Blue Shield
Let Stahn HP to be reduced to 10% or less inside Batlle or outside (by getting shoot by the Monsters). You will also get the Treasure automatically if you entered the Floor with less than 10% HP.
Fight both Blue Will O'Wisp one after another. You may fight the other Monsters before or after both Blue Will O'Wisp, but not in between. If you already have the GC Rod, then you will get the Green Gel.
Fight the Monsters in this order: Wizard, Sorcerer, Mage, Druid. The Monsters tend to teleport on the same spot, so be careful and try to fight one by one while the other are visible in other spots.
Ignore the Chest and fight the Monsters in this order: Lizard, Hyper, Mirror, Black and Blue. A new Chest will appear, inspect it and say Yes. It will then disappear and go to the Chest which already exist on the Floor.
Wait 10 seconds in every corner. If you don't have the GC Rod, then you will only receive the Green Gel. If you already have the RC Rod, then you will get the Green Gel.
Go south from where you appeared on Floor and wait there 30 seconds. If you start by the southern Wall (in this Case you can't go south!), then go north and wait there 30 seconds. If that don't work, then try this out: Get hit by the Sorcerer's fire, then fight the Green, Red, then Blue Roper.
You have to break a certain Wall which is in the 3. Row from south between 3. and 4. Pillar and walk over the debris. You may also break other Walls, but you cannot walk over these debris other than the specific debris!
To make things easier fight all Monsters except the Red Knight, then go to the central part on the northern Wall. Go south through any Walls and hit the southern Wall and go back. After you touched the northern Wall, then fight the Red Knight. If you don't have the other Rods, then you will only receive the Green Gel. If you already have the BC Rod, then you will get the Green Gel.
Fight the fast-moving Hyper Knight to make another Wizard appear to the 2 other Wizards. Fight this one and a Quox will then appear. Fight it to make Druaga appear. You can only defeat it if you have all 3 Rods. You can steal the Faerie Ring off it. If you don't defeat Druaga, then the Stairs won't get you to Floor 60 but instead send you back to any Floor between 30-39.
Talk with Ishtar, then walk around to place 2 Rods on Grounds on the second northern corridor and second southern corridor. Now examine the strange Stone on the middle corridor to make Ki appear. Talk to her and walk right to place the last Rod on the Ground.
Congratulations! You have beaten the Tower. Ki will give you a Treasure and send you back to the Entrance of the Tower. You can redo to grab new Treasure (marked Red).
GC Rod (Cloudius, missable)
RC Rod (Swordian R&D Lab)
BC Rod (Harmentz)
BC Rod you need to get the 
Old Cane you gave at the begin of the Game to Watt in Harmentz and use one Rune Bottle or Philia Skill "Identify" to transform it into BC Rod. Once you've got all 3 Rods, then go to the Temple in Janos where Rutee was confined. If you have Mary in your Party, then she will introduce you to the Tower. Place all 3 Rods on the Pedestal and the Gate to the Tower will open and a mountain of Treasure await you including stronger Monsters.
E. Bullet there and threw it away for the R. Doll. You then exit on Floor 59, because you think you're too weak for the Boss. After you reenter the Tower again you will find out the 
Life Bottle), then the Chest won't show up, even if you have fulfilled the requirements for it to reveal it.
Green Gel in most case. The Treasure is there just once too.
before taking the 
away.
Moon Sword appear.
(Moonstone)
(Emerald)
Blue Shield / 
(Sapphire)
