Using Reverse BiTMagic, it is possible to set the flag that allows you to fly to the Temple of Time statue as soon as you land in Lanayru Mines. This skips the entirety of the first Lanayru Visit, including all of Lanayru Mining Facility.
The corresponding Skyloft flag is set at the end of the introductory Batreaux text; you can press A to clear his final textbox (which is the sixth after the dialogue option) and start your file at the same time. In order to access Batreaux in BiT, we use BiTMagic to unlock both the shed door leading to him and the door to Batreaux himself; this is most easily done by a file saved in Eldin after beating Earth Temple, which has talked to the Mogma right outside the Digging Mitts cave.
Save at the Mine Entry statue and activate BiT. Perform a BiTWarp using the Upper Academy statue. Link will land far OoB, so make your way back to the entrance to the Lanayru Caves. From here, you can go left to the Lanayru Gorge or right to the Western Desert.
It is possible to throw a bomb before hitting the timeshift stone, and have the bomb kill one of the two Technoblins during the cutscene right after they spawn. The last one can then be killed normally. This is the fastest fight, but the window is quite narrow. If you have trouble hitting the timeshift stone, try holding right and Z for a few frames before the spin attack.
An alternate strategy is dependent on where the Technoblins move during the cutscene when the timeshift stone activates. If the one pictured during the cutscene walks towards the boundary of the timeshift area, a Skyward Strike will knock him out of the area. You can then throw a bomb to the front-right corner of the cage to cause the second Technoblin to run back into the cage, but he will still be in range of the bomb blast. Combining these two strategies yields a very fast fight.
If the Technoblin walks towards you during the cutscene, you can place a bomb to the side of the cage and slash it with your sword. If done quickly enough, both Technoblins will blow up. This is the fastest way to handle this random occurence.
As an added time save for all of these strategies, if you front-hop jumpslash into the cutscene trigger as the end-fight cutscene plays, you'll immediately trigger the Hook Beetle cutscene, skipping a small cutscene and running over to the rescued robot.
It is possible to skip going through the Temple of Time area to reach the Northeastern desert area. There are two methods for doing so; the current method used in runs is the Brake Slide method. For the older Ampilus and BiTWarp methods, see Unused Strategies.
By using the Brake Sliding technique, Link can cross the giant sand pit which normally blocks him from reaching the northern part of the desert early.
It is possible to skip using the Ampilus shell to cross the sand in the Fire Generator room by using a Brake Slide to cross instead.
This is approximately the same speed as getting good luck with the Ampilus behavior, and saves time over bad luck with the Ampilus or its shell.
It is possible to skip the Fi text that normally plays when you try to insert an Ampilus egg into the slot that opens the gates in the generator rooms. Hold Z to get right on the edge of the central platform so that it is pressed down, then release Z and stab. The egg will roll into the slot without the Fi text triggering.
Note that you must do this in both generator rooms; since the Fi text is fairly short, you must be fairly quick about setting it up or you won't end up saving time.
After the cutscene where you obtain the Goddess Harp, it is possible to skip the Fi text by sidehopping or backflipping out of the trigger before it starts. Hold Z while selecting cancel at the save prompt, then mash or time the backflip. The window for this trick is only 2 frames, so it is easy to miss.
An amusing side effect of this trick is that your main quest dowsing option will remain as Zelda's face for the rest of the game. This does not affect the dowsing functionality.
Upon reaching the Sand Sea, it is possible to use Reverse BiTMagic to allow you to access the dock where the Sandship is eventually moored. This allows you to sail directly to the Sandship after embarking in the Sand Sea, skipping Skipper's Retreat, the Shipyard, and the Pirate Stronghold.
The corresponding flag on Skyloft is for collecting the gratitude crystal in the loftwing prison past the waterfall cave; in order to achieve this during BiT, an early game file must have the ability to collect crystals written onto it using Reverse BiTMagic.
In Skipper's Retreat, there is a Deku Baba guarding a clawshot target. If you clawshot to the left of the target, the Baba will be distracted long enough for you to clawshot the target and then clawshot away, saving using the slow Hook Beetle to kill the Baba.
By running to the left edge of the first Beamos that spawns, you can fit through the gap between the door frame and the beamos and thus avoid fighting it.
In the short hallway with several Deku Babas, you can easily avoid them by pausing briefly before continuing.
In the last section of the stronghold, you can skip a short cutscene that looks at a whip lever by jumpslashing over the trigger as you go through the doorway.
There are three places during the minecart escort where you can intentionally void to move the minecart forward.
After the first main room with the Technoblins and the Deku Babas, running off the edge right after you hit the switch will respawn the minecart slightly forward. This void saves at most 2 seconds.
In the long room with the giant vine wall, when you reach the end of the vines there are two platforms that appear. Wait for the second platform to appear and then jump over the wall next to it. When you respawn you'll be on a platform above next to a switch. This void saves about 10-15 seconds.
After opening the gate with the whip, the passage way turns twice and then has a pit. If you jump into that pit, the minecart will warp forward when you respawn there. This void saves about 6-8 seconds.
In the final section of the minecart escort, there are some rocks on a pillar that must be exploded, usually using the Hook Beetle. However, it is possible to use a precise bomb throw to land a bomb on the pillar next to the rocks and blow them up that way.
In Any% speedruns, when combined with other RBM tricks, this makes the Hook Beetle completely skippable.
Reverse BiTMagic can be used to load the trial gate which gives access to Nayru's Silent Realm early, even on the first visit to Lanayru. This allows you to obtain the Clawshots on the first visit to Lanayru.
The corresponding flag is the end of a certain conversation with Professor Owlan in the classroom on the ground floor of the Knight Academy, requiring an early game file which is saved after speaking with Zelda at the Goddess Statue, but before rescuing your loftwing.
This is currently not used in the Any% route, which instead completely skips Nayru's Silent Realm by delaying Clawshots until Bokoblin Base.
By luring an Ampilus to the proper spot, it is possible to kill it so that its shell lands up against the metal wall. You can then climb on the shell and climb over the wall to the Stone Cache.
The setup is somewhat precise; after the second shield bash, the Ampilus should be next to the wall at about a 45 degree angle.
This is not used in runs because the Brake Slide version of this skip is about 9 seconds faster, and significantly easier.
After reaching the Lanayru Desert, save at the West Desert statue and activate BiT. Perform a BiTWarp with the Upper Academy statue. You will appear next to a chest in the Northern Desert, thereby skipping the Temple of Time area.
This is not used because the Brake Slide version of this skip is faster by about a minute.
After obtaining the Gust Bellows, save at the Lanayru Gorge statue and activate BiT. Perform a BiTWarp using the Upper Academy statue. This will put you on top of the cliff. From here, make your way over to the Tree of Life and activate the Timeshift Stone to get the seedling. You can get back across the gap by deathwarping.
This is not used in runs because the BiTLoading version of this trick is faster.
At the end of the escort, there is a section where you are supposed to use the beetle to grab a bomb and blow up some rocks. It is possible to use your own bomb, back up and quickly use the Beetle to carry your bomb to the rocks.
This is not (or should not) be used in runs, as it is slower than doing the intended method. It is only mentioned here because unknowing speedrunners have been known to do this in the past.
After obtaining the Life Tree Seedling, run back to where the bridge was and use the bow to shoot the timeshift stone. The hitbox for the stone is strange; you need to aim higher and more to the right than it seems.
This is not used because the current route gets the Life Tree Seedling via BiT.