From StrategyWiki, the free strategy guide and walkthrough wiki

This page only pertains to the "Darkness Tower" contained in the PlayStation version of The Tower of Druaga, which is contained in Namco Museum Vol. 3. Like the "Another Tower" contained in the same game, it has its own mazes and groups of enemies that are different from the original version. Additionally, the floor numbers start at 61. The following table contains the exact treasure contained on each floor and the method required to reveal it.

FL	Item	Reveal Method
61		Kill ×6
62		Kill ×2
63		Kill the which appears in the stage first, and then kill the that appeared last.
64		You need to destroy the last enemy and collect the key at as close to the same time as possible. Make sure you're standing near the key when you destroy the final enemy.
65		Block the spells of a three times, then destroy every in the stage.
66		Touch some part of the east outer wall, then turn around and face west.
67		First, collect the . Then use the copper pickax up completely.
68		Draw your sword as you enter the upper left corner. The will be empty.
69		Cancel a flame with your sword two times.
70		Destroy the small slime.
71		Touch some part of the north outer wall, then turn around and face south.
72		Either the or any must appear in the far left passage.
73		First, destroy every enemy. Then collect the .
74		The appears when the timer reaches 2000.
75		You must pass through a and a .
76		You must touch the left and bottom outer walls.
77		The single must warp a total of ten times.
78		Remain in contact with the outer wall for at least 10 seconds.
79		Do not open the door until the timer is below 5000.
80		The appears when the timer reaches 19000.

FL	Item	Reveal Method
81		Touch the , then collect the
82		Destroy the large slime.
83		First, collect the without killing any enemies. Then you must kill any magician without killing any of the slimes.
84		Shake the sword twice at the starting position. Then pass through the starting position.
85	655200 points	Pass through each one of the four corners, then stand on the door.
86		Pass through the , then collect the and open the
87		You must shake the sword twenty times. You may not kill an enemy in the process.
88		Draw your sword, keep it drawn, and stop on top of the door.
89		Shake your sword against any part of the outer wall, breaking the silver pickax in the process.
90		You must find a particular , and overlap with it. The correct one will be random, so you must try each of them.
91		Press the button.
92		You must shake the sword four times.
93		First kill the . Then kill the . Then draw your sword and pass through the
94		Do not kill any before you kill the
95		You must pass through a as well as a . Since you may lose your strength by touching the Roper, pass through the Dragon first.
96	Book of Slimes	Receive one, and only one, spell from a . Then stand on the . The Book of Slime grants you the power to see transparent slimes.
97		You must collect the , and you must kill all of the slimes in size order (small to large). Once you do all of that, cross paths with a Roper to make the appear.
98		You must get a and a to cross paths.
99		All the walls that lie in the same row and the same column as the must be destroyed with your pickax.
100		All of the white slimes must be destroyed before the timer reaches 8000.

FL	Item	Reveal Method
101	DEATH	After killing a , you must cross paths with a and a
102		Cross paths with a or a . Then collect the and open the . Finally, cross paths with another Will'o Wisp to reveal the
103		Destroy the slimes in size order, from smallest to largest.
104		You must kill, in order, , and then cross paths with the
105		Available right away, but if you open it without collecting the Antidote first, it will become a Potion of Death.
105		You must kill, in order, , then collect the Antidote before you collect the Hyper Sword.
106		Before the timer reaches 10000, you must cross paths with the small . After the timer reaches 10000, you must cross paths with the large .
107		You must kill a when it is located on the left-most edge of the stage.
108		You must walk through, not the very corners of the stage, but each of the corners which are one row and one column towards the inside of the stage. (e.g. don't walk through the upper left corner, walk through the square one column to the right, and one row below.)
109	Platinum Pickax	After crossing the correct , break the Gold Pickax against the outer wall.
110		Destroy every Roper.
111		Keep your sword drawn, and block three spells with your shield from the side.
112		Smash 20 walls with your pickax.
113		Kill a .
114		Very similar to Floor 53 of the original version, stand in the square 9 columns from the left, and 7 rows down, smash the south wall, and walk down to the next square.
115		This stage has a particular design. Starting in the middle row, all the way inside the pocket just right of center, walk one square left, one square down, and one square right.
116		First, absorb one spell with your Hyper Armor. Then block one spell with your shield. This key is needed to escape floor 117
117		This stage appears much like Floor 60 of the original Tower. You must walk to the same places you had to walk to in order to make the statues appear, i.e. one row above the lowest row, one row above the highest row, and down the middle row. As you proceed down the middle row, will appear, but this Ki is fake and you must kill her. If you happen to possess the Blue Crystal Rod from the next floor, you will lose it at this time.
118		First, kill a and a . Then pass through a with your sword drawn. Once it is defeated, walk through the point at which you defeated it to make the appear.
119		The clear method is the same as Floor 59 of the original tower. Find and defeat the fast moving , then defeat the one real out of the four that will appear, then defeat the . Finally, defeat before you exit through the .
120		First walk all the way to the right and touch . Then come back and walk along the bottom row. Push down when you are six columns away from the left outer wall. Walk up to the very top row and push down again in the sixth column. Then walk all the way down the center row, touch , and push down at the sixth column to win the game.