Two small key chests on this floor can be easily duplicated to be smuggled into later floors. They can be duplicated as many times as desired until you fail the set up. Keys persist across Tower of Spirits sections, allowing them to be used in ToS 5 and 6 as well.
A full route of this floor with key duping can be seen below.
Small key skip
A PDF guide written by ToadsWoot can be found here.
This can also be done via jump attacking the Phantom Eye. (Video by Jasnix08)
15th floor
Left side puzzle shortcut
It is possible to shortcut the left-size puzzle using various methods.
First method
Second method
Third Method
Fourth Method
5th visit
18th floor
Big Block Puzzle Skip
Using a block clip, it is possible to climb on the wall next to the small key chest and grab the key.
20th floor
Door Unloading
The door can be unloaded by moving it off screen and then quickly looking back toward it once the arrow is past, skipping the entire Wrecker Phantom puzzle.
6th visit
26th floor
Tower of Spirits 6 Skip
This trick skips most of ToS 6, allowing you to completely skip floor 26F.
Wrecker Phantom
This trick is now obsolete with the major ToS 6 skip.
Warp Phantom Skip
This trick is now obsolete with the major ToS Skip.
By blowing Zelda over the sand it gives enough time to equip the sand rod and save her from sinking. From there simply grab the arrow pod and resume the puzzle as normal.
This trick allows you to skip grabbing the warp phantom after completing the wrecker part of the room. Along with Wrecker Phantom Skip you can complete the entire floor 26 with just the torch phantom, saving more then a minute.
