After backtracking through the tower to collect the glass pieces players head down into the basement of the tower for the last piece.  These levels are all new, and as a twist you are trying to climb down instead of up.  There are tons of new and difficult puzzles, and the majority of the levels involves backtracking through areas and using light gates to help yourself advance.  Once players have collected all the glass shards and gone back to the top of the tower they are transported to the Dark Tower.

B1F

1. Head left and fight the giant swinger
2. Continue left across the pits, avoiding the saws and kill the super spinners
3. Keep moving past the shooters and to the next pit
4. Lure the blue rollers to the edge of the pit, then lower the girder they’re standing on
5. Raise it back up, then jump across and lower yourself down
6. Enter the gate and exit the right hand gate
7. Raise the two girders and jump across (kill the giant floaters and avoid the saw)
8. Flip the lever, then backtrack to the gate
9.  Memory:  Enter the left side gate and raise the girder, jump across and kill the giant swarm
10. Return to the center gate and raise yourself back up
11. Head left, before the flame jets jump up onto the pipe and climb to the left
12. Enter the door and kill the two giant swingers
13. Continue left and climb the ladder, then head right to unleash the spider king
14. Raise the levers and continue to the right past the saw, hit the pyramid
15. Coax an arrow from the shooter in the upper left to hit the pyramid on the upper right
16. Drop back down and head right (kill the spider king) and continue through the two doors
17.  Monitor Eye:  across the gap to the right over the saw
18. Drop down and head left, watch out for the flame jets
19. Continue left killing the giant swarms
20. Lower the wall to the left and jump across to it
21. Raise it back up and climb the ladder, then jump to the right and flip the lever
22. Lower yourself back down and head back to the right
23. After the flame jets jump up to the platform, then ride the moving platform up
24. Enter the shadow corridor to the right
25.  Health Regen:  to the right
26. Enter the gate and move the tall block down one space
27.  Light Regen:  north and south of the blocks
28. Move the small block to the left and onto the lower left button
29. Move the tall block up and onto the upper right button
30. Exit the right gate
31. Jump up and head to the right, enter the gate
32.  Light Regen:  left and right of the blocks
33. Move the right block up one space, move the middle block to the left
34. Move the right block down one space and to the right
35. Exit the gate
36. Drop down to the lower gate and enter it
37. Exit the left gate
38. Exit the corridor to the left
39.  Monitor Eye:  to the right
40. Drop down and head back to the left, continue past the wall you lower to the next thin girder
41. Jump to it and lower it down
42. Enter the gate and head south
43.  Light Regen:  at the south side
44. Jump to the right and dodge over the spinning blades
45. Continue right across the platforms and hit the button
46. Backtrack to the left and exit the gate
47. Ride back up and flip the lever to the right
48. Ride back down and enter the gate
49.  Monitor eye : jump to the left and run past the saws
50. Backtrack and exit the gate
51. Ride up and jump to the left, avoid the saws and enter the two locked gate area
52. Kill the shooter and giant swinger
53. Head left and break down the shadow wall then climb down to continue

B2F

1. Head to the left, kill the giant swinger and dodge the saw blade
2. Raise the platforms around the spinning blades
3. Jump to the upper platforms and across to the left
4. At the horizontal saw blade stand on the upright girder and lower it
5. Enter the light gate and head to the right, climb the platforms and jump across above the spinning blades
6. Continue down to the right
7.  Light Regen:  jump across to the right
8.  Monitor Eye:  Head north along the walkway
9. Backtrack and exit the gate
10. Raise yourself back out, then head to the left over the saw
11. Continue left and jump up to the shadow corridor
12.  Health Regen:  to the right
13. Head to the right and enter the third gate
14.  Light Regen:  to the south
15. Head left at the regen point and hit the button
16. Exit the gate and head to the right through the opened door
17. Enter the gate, press the button to the left and exit again
18. Head back to the gate on the left and enter it again
19. Head right at the regen point and south through the gate, hit the button
20. Return to the regen point and head south, down the ladder and to the left
21. Hit the button and exit the nearby gate
22. Head to the left and exit
23. Head left onto the girder and lower it
24. Enter the gate, head south, west, jump across, then south again
25.  Light Regen:  at the southern end of this walkway
26. Head to the left and drop down the moving platform, then across dodging the saw blades
27.  Light Regen:  down the ladder and continue a bit to the left in the open area
28. Climb up the ladder to the north
29.  Light Regen:  north at the top of the ladder
30. Continue north and hit the button
31. Backtrack to the regen point at the foot of the ladder
32.  Memory:  left past the saw blades and across the platforms
33. Backtrack to the east up the ladder and moving platform
34.  Monitor Eye:  north along the walkway
35. Head back and exit the gate
36. Ride back up on the girder
37. Head to the left into the locked area and kill the two waves of giant darts
38. Continue left past the spinning blades and across the platforms
39. Drop the girder down at the next spinning blade, then jump down
40. Hit the sphere and continue to the left
41. Jump onto the crate to release the blue circle shooters, make them run into the spikes to kill them off
42. Continue across to the left and stand on the girder between the two blades, raise it when its safe
43. Flip the lever to the left
44. Dodge the blades to the right and drop down
45. Climb down the ladder dodging the saw blade, and repeat down the next ladder
46. Enter the gate at the bottom and head down and to the left, jump across the platforms and hit the button
47.  Monitor Eye:  Backtrack to the gate to replenish your energy then head back and to the north dodging the spinning blades
48. Exit the gate once more and climb back up
49.  Memory:  backtrack all the way to the ladder you lowered, climb up the ladders dodging the saw blades and jump to the left
50. Head to the left and lower the girder you raised
51. Continue left and kill the jumpers when the doors lower
52. Break down the shadow wall and continue down the ladder

B3F

1. Head to the right past the first gate, kill the spider and jump over the pipe
   
2. Below the second gate raise the girder
3. Enter the gate
4. Memory: on the platform to the right
5. Continue to the right past the saw blades, killing the swinger
6. At the ladder jump onto the moving platform to the right and ride it up
7. Head to the right and lower the girders along the way to cook the giant fliers
8. Continue right past the spider king and rotate the three platforms beneath the large tank
9. Drop down and ride the moving platforms to the bottom
10. Enter the shadow corridor and head to the right
11. Jump to the box by the spikes and move the sliders up and right
12. Hop down onto the box to your right and move the slider to the left then up
13. Jump over to the left and flip the lever
14. Move the sliders down and to the center (middle of the bottom)
15. Jump up on the box and onto the higher platform
16. Backtrack how you game in and drop through the hole that opened
17. Move past the flame jets and move the sliders left and down
18. Jump up and continue to the right
19. Move the slider up and right, then jump above the flame jets
20. Move the slider left and jump to the next platform, then move the slider down
21. Jump to the high platform on the right and move the slider up
22. Continue onto the girder on the right and move the slider to the right
23. Drop down to the right onto the lower platform and move the slider down
24. Head left under the girder and move the slider left
25. Drop down and move the slider up, then exit to the left
26. Continue left killing the spiders and enter the light gate
27. Light Regen: to the right
28. Head to the right and hit the button, then back to the left and exit
29. Monitor Eye: enter the gate and head left, then back to the right and exit
30. Climb the ladder to the left then drop down
31. Enter the light gate and head north along the path to hit the button
32. Light Regen: half way along the path to the north after jumping the platforms
33. Backtrack to the gate and exit
34. Head left killing the circle shooter  and continue to the left
35. Climb the saw ladder back to where you rode the first platform up at the start
36. Continue all the way back to the left and enter the first gate you passed at the beginning of the level
37. Head south and to the left and drop down the ladder, then exit the gate at the bottom
38. Jump to the right platform, head over the spikes and pull the lever
39. Backtrack to the gate, climb up the ladder and exit the top gate
40. Head back to the left and drop down the saw ladder, then continue to the right and enter the gate
41. Light Regen: South and left
42. Continue along the path to the left and exit the gate at the far end
43. Jump up to the left and enter the shadow corridor
44. Health Regen: to the right
45. Head right and drop down to the right of the large block as it moves to the left
46. Move beneath the wall to the right and jump onto the large block as it moves back toward you
47. Walk to the right block and ride it up
48. Move onto the next block to the right and hang off the right edge
49. The block will move to the right and allow you beneath the upper ledge
50. Climb up and jump onto that ledge
51. Continue up and to the right, then jump to the large block on the right and drop off the right side
52. As it moves drop down to the lower level then run to the left onto the next block
53. Drop down to the left then move a bit to the right into the sunken part of the girders
54. When the block passes over you head to the right and quickly jump up the platforms before you get squished
55. Exit to the right
56. Stained Glass: go left and enter the gate, continue to the left
57. Backtrack and exit the gate the head back to the right
58. Head back through the gate on the right to the next gate far to the right
59. Go back to the left and climb the saw ladder, then ride the moving platform up
60. Continue to the right, drop down as you did previously, then climb up the other side
61. Move the rotating blades once more and jump up to the right
62. Continue through the open door and repeat the process to drop down
63. Ride the platform down and enter the gate to the right
64. Monitor Eye: south along the path, then across the platforms
65. Light Regen: to the left
66. Continue left and press the button
67. Light Regen: to the left
68. Continue across the platforms to the left
69. Monitor Eye: climb the ladder to the top
70. Drop down the left side and exit the gate
71. Head up the saw ladder to the left once more
72. Ride the platform and make your way to the right as you have been, past both the moving blades
73. Continue right killing the spiders and jump across the platforms killing the giant floaters
74. Break down the shadow wall and exit to the right

B4F

1. Head to the right and move the rotating blades
   
2. Drop down and kill the spinner, then jump to the platform on the right
3. Continue right across the platforms and flip the lever
4. Keep going right past the giant darts and flip the next lever
5. Continue right past the third lever and enter the light gate
6. Run to the left and press the button, then backtrack and exit the gate
7. Head back to the left and flip the lever, then backtrack all the way to the door that opened
8. Monitor Eye: move across the platforms to the left killing the giant fliers
9. Backtrack to the right past the light gate you entered earlier
10. Ride the moving platforms down, then drop down the ladder
11. Head to the left down the ramp killing the spinners
12. Lower the girder to cook the blue flier
13. Drop down the ladder on the left (stay close to the ladder) and jump across to flip the lever
14. Jump to the left and enter the gate
15. Memory: to the right
16. Head to the left and exit the next gate, be prepared for the swinger as you exit
17. Flip the lever to the left then backtrack through the gate to the first one you entered
18. Move left over the platforms past the giant darts and continue to the ladder
19. Climb up and head left killing the spider king
20. Drop down the saw ladder and enter the shadow corridor
21. Health Regen: to the right
22. Jump up onto the platforms, once you get onto the thin platform it will begin rising rapidly, you must avoid getting squished beneath the platforms above you
23. Exit the elevator at the top to the right and onto the next elevator
24. This one will move a bit slower, but you must avoid the arrow shooters and platforms as it rises
25. Head to the left onto the third elevator
26. There are no platforms on this one, but enemies will spawn as it rises slowly, quickly defeat them so you don’t get overwhelmed
27. Exit to the right
28. Monitor Eye: head a bit to the left and stand on the girder beneath the opening above you, raise it upward
29. Lower yourself back down then head left and ride the platform down
30. Drop down the ladder and head to the right
31. Monitor Eye: beneath the second saw blade
32. Continue right down the next ladder, then across the platforms avoiding the spinning blades
33. Kill the two spider kings and giant swingers in the locked section, then continue right over the platforms once more
34. Hit the sphere as you continue right and break through the shadow wall
35. Exit to the right

1. Head right over the saw blades killing the super swinger
   
2. Continue right through the open door across the platforms
3. Kill the giant swarms and super spinners in the locked area
4. NOTE: if you fall in here you have to start over
5. After the doors open continue to the right past the saws and giant swinger
6. Drop down to the right and head into the elevator
7. Ride to the 54F
8. Climb up to the 55F
9. Head left and enter the light gate, then approach the altar and deposit your glass pieces
10. Activate the altar and enter the dark tower

Garden

Lower Tower

Factory

Reservoir

Residential Section

2nd Factory

Shrine

Sewer

Dark Tower

Garden Labyrinth