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A '''Bomb Space Jump''' ('''BSJ''') is a height technique that takes advantage of [[Instant Morph/Unmorph|Instant Unmorphs]]. It allows you to immediately unmorph and jump after you have done a Single, [[Double Bomb Jump|Double]], or [[Triple Bomb Jump]]. The key is to be in an area in which you are able to get an Instant Unmorph, as it otherwise is impossible to do this technique.
A '''Bomb Space Jump''' ('''BSJ''') is a technique that allows Samus to get a jump with greater height than a standard jump or [[Space Jump Boots|Space Jump]]. It is most often used in situations where standable collision is nearby, but it requires a greater amount of height than is normally possible in order to land on it. BSJs take advantage of two properties:
*Samus having jumpstate 4 while in [[Morph Ball]], as described in the page for [[Jumping]]
*Samus being able to perform an [[Instant Morph/Unmorph|Instant Unmorph]] during the period when jumpstate 4 is active, by which point you can press B to jump while still in the air.
Technically, the term for Bomb Space Jump should be an Instant Unmorph Jump (or IUJ) because a Bomb Space Jump doesn't actually require [[Morph Ball Bomb|Morph Ball Bombs]] in order to work. One prominent example of this is during [[Exo Skip]] when performing the [[Secret World]]; optimally this is done with what is sometimes referred to as a '''Bombless BSJ''' in order to immediately stand on the door frame.


It helps to hold L after you have started jumping so that you can jump higher/farther.
Bomb Space Jumps have various use cases across all three games. They are generally most common in [[Metroid Prime 2: Echoes]], as there are less instances where standable collision is the basis for climbing large vertical gaps. Generally, they are also similar in mechanics across the three games as well. [[Metroid Prime 3: Corruption]] is the most different of the three, in that in addition to the standard BSJ, it is also possible to utilize the [[Morph Ball Bomb|Spring Ball]] as the basis for a BSJ. This also applies to the [[Metroid Prime Trilogy|Trilogy]] versions of Prime 1 and Echoes.


== How-To ==
==General Overview==
The general steps are as follows:
[[File:Bombheight.png|thumb|Graph showing the height Samus gets from a single bomb while in Morph Ball. The yellow portion highlights the frames in which Samus has jumpstate 4. Peak height is 3.409 units.]]When Samus is in the [[Morph Ball]] and the game detects her to be in the air, the game temporarily sets Samus' jumpstate to jumpstate 4. Jumpstate 4 allows for Samus to jump while in the air for a total of 22 frames. However, since at least 1 frame is required to Instant Unmorph, the amount of frames we can take advantage of is reduced to 21. After these frames have passed, the game sets Samus' jumpstate to jumpstate 2 ("Free-fall") at which point she will no longer be able to jump until she hits the ground again, resetting her jumpstate to 0. It is generally impossible, outside of a few niche cases under [[Tool-Assisted Speedruns|TAS]] conditions, to extend the duration of these frames by fooling the game into giving you jumpstate 0 by rubbing onto collision seams.
* Lay the initial Bomb
** If doing a Single BSJ, unmorph after the bomb explodes
** If doing a 2BSJ, lay two bombs in succession after the first bomb explodes, then unmorph
** If doing a 3BSJ, lay three bombs in succession after the first bomb explodes, then unmorph
* Jump after the Instant Unmorph


== Prime ==
Below are descriptions of each type of BSJ one can expect to encounter. Each subsection will reference the optimal height: this is assuming Samus only uses one of her jumps after optimally Instant Unmorphing at the best possible frame, and that she does ''not'' have [[Space Jump Boots|Space Jump]]. The true height gain from a BSJ will vary depending on how well you perform the jump and the circumstances of the room itself. The higher Samus is when she unmorphs and presses B, the higher the jump will be.
In Prime speedruns, BSJs are very rarely used. One notable trick that requires the Bomb Space Jumps is [[Elevator Access A]], which is the first shaft in [[Spiderless Shafts|spiderless shafts]]. Another use of the trick is in [[Phazon Core]].


BSJs in Prime use 1 or 3 bombs.
===Single BSJ (1BSJ)===
[[File:BSJcomparisongraph.png|thumb|Comparison of all types of BSJs. Blue = 1BSJ; Red = 3fBSJ; Yellow = 2BSJ; Green = 3BSJ.]]A single BSJ, or 1BSJ, is the simplest form of BSJ. Naturally, there isn't much to it, but getting the optimal height entails performing the Instant Unmorph at around 16 frames in. The optimal height for this type of BSJ is 6.845 units.


{{#ev:youtube|https://www.youtube.com/watch?v=9Tyvnh_EKK4}}
===3fBSJ===
3fBSJ stands for 3 frame Bomb Space Jump. It refers to when two bombs are laid in the same place at once in a small amount of time, allowing the Morph Ball to get hit by all two of the bombs as it is first getting off of the ground. It provides more height than a single BSJ, but less height than a 2BSJ. As the name implies, the bombs must not be laid more than 3 frames apart to get the most out of this method, as the bombs will not be able to hit Samus otherwise. The optimal height for this type of BSJ is 8.268 units.
 
===2BSJ===
The 2BSJ is less precise and more efficient than the 3fBSJ. The second bomb should ideally be spaced in the middle of jumpstate 4 (around 10-11 frames in) to get the best possible height, but there is a decent amount of room to gain a significant amount of height over a 1BSJ, even if the bomb is placed suboptimally. The optimal height for this type of BSJ is 9.260 units.
 
===3BSJ===
The 3BSJ grants players the most height out of any standard BSJ. The setup for this type of BSJ is actually different between games, owing to the changes to the way bombs are programmed between Prime 1 and Echoes.
*In Prime 1, performing a 3BSJ requires wasting an additional bomb beforehand, then waiting to lay the first bomb at the proper time such that the internal timer resets after it is laid.
*In Echoes, you do not need to lay an additional bomb before performing a 3BSJ.
Naturally, performing a 3BSJ in Echoes is faster than performing a 3BSJ in Prime 1. Likewise, 3BSJs in Prime 1 are the slowest BSJ method. As such, they should only be performed in situations that require it for speedruns. Ideally, the bombs should be laid between 6-7 frames of eachother to get the most height out of this method. The optimal height for this type of BSJ is 10.1329 units.


== Echoes ==
===4BSJ and beyond===
BSJs are quite commonly used in Echoes speedruns.
In Prime 1, it is possible to have more than three active bombs at once. This has limited applications for BSJs in a [[Tool-Assisted Speedruns|TAS]] setting, as by this point the height gained by each individual bomb is starting to have diminishing returns. There is no current use for 4BSJs outside of TAS.


The most common and applicable way to be in a good position is to have your back against a wall. An easy way to achieve this camera position is to have your back to the wall, and then briefly move forwards and morph. Also, you want to be moving backwards as you are popped up from the bombs in order to facilitate getting the Instant Unmorph (assuming that you are doing the standard setup where you back is to a wall). There are some other cases in which you might want to be moving forward as you are launched up. Again, it all depends on what it takes to get the Instant Unmorph.
===IUJ (Bombless BSJ)===
As alluded to before, an Instant Unmorph Jump (or bombless BSJ) is the same thing as a BSJ, but it doesn't use bombs in order to get Samus into jumpstate 4. This can be done as Samus is getting repositioned [[Out of Bounds]] such as during the first stages of the [[Frigate Wallcrawl]] or [[Exo Skip]], or by rolling Samus in such a way that she gets in the air, like in [[Central Station Access]] for certain low% categories.


TODO: <video of BSJs in Echoes>
==Examples for Each Game==
Bomb Space Jumps are used to differing degrees in each of the three games. This section highlights some notable examples for each game, showcasing various different types of BSJs for different rooms and situations.


== Corruption ==
===Metroid Prime===
Just like in Echoes, BSJs are also common in this game. BSJs in this game can be combined with [[Spring Ball]]. The initial bomb can be a Spring Ball instead. There are two BSJs used in Corruption:
Bomb Space Jumps have some significant use cases in Prime 1 speedruns, but as a whole they are not as common as they are in Echoes. They are mostly used for specific tricks where other standable collision cannot be used to climb a room.
* Spring Space Jump (SSJ)
* Bomb Spring Space Jump (BSSJ)


TODO: <video of BSJs in Corruption>
====Spiderless Shafts====
In [[Elevator Access A]], the first room for Spiderless Shafts, a 2BSJ is used in order to gain the height necessary for the first standable spot. This is required for the fastest any% routes.
{{#ev:youtube|https://www.youtube.com/watch?v=9Tyvnh_EKK4}}


= Instant Unmorph Jumps =
====IUJ During Exo Skip====
This is an example of an Instant Unmorph Jump in Prime 1, in the room [[Crater Tunnel B]]. When the Metroid repositions Samus out of bounds, she has a small window to Instant Unmorph and press B to jump. If successful, Samus will be able to stand on top of the door frame immediately, quickly allowing for the rest of the wallcrawl to be done without falling deep into [[Phazon Core]].
{{#ev:youtube|https://www.youtube.com/watch?v=HTRo5Fazyr8}}


An '''Instant Unmorph Jump''' ('''IUJ''') is a subset of BSJs with the main difference being that Bombs are not used. Technically, BSJs are just IUJs with Bombs, to keep things simple, this will be referred to as a separate trick. There are a few methods to pull off an IUJ.
===Metroid Prime 2: Echoes===
BSJs are very commonly used in Echoes speedruns, having applications in various rooms throughout the game and finding uses in all major categories.


== Method 1 ==
====Alpha Blogg Skip====
The first method is used in both Prime and Echoes. This method just involves unmorphing after getting the camera blocked. A notable use of this in Prime is the [[Secret World]] in [[Biotech Research Area 1]]. When Samus gets repositioned [[Out of Bounds]], an IUJ can be performed to land on the sticky collision of the wall.
One of the best examples of BSJs in Echoes is in [[Main Hydrochamber]], during the Alpha Blogg fight. Since Samus will have the [[Gravity Boost]] by this point, it's possible to perform a BSJ into a Gravity Boost to get enough height to reach the top of the room, skipping the Alpha Blogg fight.
TODO: <video of clip or just have the link to the SW here>
{{#ev:youtube|https://www.youtube.com/watch?v=OSnzyN6ZFR0}}


In Echoes, an IUJ can be performed after the Morph Secret World in [[Temple Transport C (Great Temple|Temple Transport C]] to transition to [[Transport C Access]] much faster.
====Temple Transport C/Transport C Access Transition====
In any% runs, the fastest route involves getting a [[Secret World]] while the map is focused on [[Temple Transport C (Great Temple)|Temple Transport C]], and using an IUJ to transition to [[Transport C Access]].
{{#ev:youtube|https://www.youtube.com/watch?v=N1bD4zG4kso}}


== Method 2 ==
====IUJ in Low% Central Station Access====
This method is rarely used in Echoes. To achieve an IUJ in this fashion, one must roll Samus backwards towards a wall and get a bounce. After bouncing upwards a bit, unmorph. If done correctly and an Instant Unmorph is achieved, one can jump in the air to gain a bit more height than normal. Note that this method is not nearly as useful as a BSJ, as it is very niche. A specific use of this trick is to climb [[Central Station Access]] without Space Jump Boots or Bombs. This can also be achieved in [[Warrior's Walk]].
This is an example of an IUJ being used to traverse a room without the [[Space Jump Boots]]. Normally in [[Central Station Access]], Samus will not be able to get the height necessary to jump onto the ledge without Space Jump. However, an IUJ can give just enough height to make it onto the ledge. This is done in certain low% categories.
{{#ev:youtube|https://www.youtube.com/watch?v=PKwxfrbtP9k}}
{{#ev:youtube|https://www.youtube.com/watch?v=PKwxfrbtP9k}}
===Metroid Prime 3: Corruption===
Just like in Echoes, BSJs are also common in this game. BSJs in this game can be combined with [[Morph Ball Bomb|Spring Ball]]. The initial bomb can be a Spring Ball instead. There are two BSJs used in Corruption:
* Spring Space Jump (SSJ)
* Two Bomb Space Jump (2BSJ)
====Docking Bay Access====
One of the first tricks in Corruption involves using a Spring Ball IUJ to quickly get onto the upper level in [[Docking Bay Access]].
{{#ev:youtube|https://www.youtube.com/watch?v=yRG14LtgjYo}}
==See Also==
*[[Jumping]]
*[[Slope Jump]]
*[[Floaty Jump]]
*[[Roll Jump]]
[[Category: Morph Ball Technique]]
[[Category: TAS Technique]]
[[Category: Movement Technique]]

Latest revision as of 06:52, 19 October 2021

A Bomb Space Jump (BSJ) is a technique that allows Samus to get a jump with greater height than a standard jump or Space Jump. It is most often used in situations where standable collision is nearby, but it requires a greater amount of height than is normally possible in order to land on it. BSJs take advantage of two properties:

  • Samus having jumpstate 4 while in Morph Ball, as described in the page for Jumping
  • Samus being able to perform an Instant Unmorph during the period when jumpstate 4 is active, by which point you can press B to jump while still in the air.

Technically, the term for Bomb Space Jump should be an Instant Unmorph Jump (or IUJ) because a Bomb Space Jump doesn't actually require Morph Ball Bombs in order to work. One prominent example of this is during Exo Skip when performing the Secret World; optimally this is done with what is sometimes referred to as a Bombless BSJ in order to immediately stand on the door frame.

Bomb Space Jumps have various use cases across all three games. They are generally most common in Metroid Prime 2: Echoes, as there are less instances where standable collision is the basis for climbing large vertical gaps. Generally, they are also similar in mechanics across the three games as well. Metroid Prime 3: Corruption is the most different of the three, in that in addition to the standard BSJ, it is also possible to utilize the Spring Ball as the basis for a BSJ. This also applies to the Trilogy versions of Prime 1 and Echoes.

General Overview

Graph showing the height Samus gets from a single bomb while in Morph Ball. The yellow portion highlights the frames in which Samus has jumpstate 4. Peak height is 3.409 units.

When Samus is in the Morph Ball and the game detects her to be in the air, the game temporarily sets Samus' jumpstate to jumpstate 4. Jumpstate 4 allows for Samus to jump while in the air for a total of 22 frames. However, since at least 1 frame is required to Instant Unmorph, the amount of frames we can take advantage of is reduced to 21. After these frames have passed, the game sets Samus' jumpstate to jumpstate 2 ("Free-fall") at which point she will no longer be able to jump until she hits the ground again, resetting her jumpstate to 0. It is generally impossible, outside of a few niche cases under TAS conditions, to extend the duration of these frames by fooling the game into giving you jumpstate 0 by rubbing onto collision seams.

Below are descriptions of each type of BSJ one can expect to encounter. Each subsection will reference the optimal height: this is assuming Samus only uses one of her jumps after optimally Instant Unmorphing at the best possible frame, and that she does not have Space Jump. The true height gain from a BSJ will vary depending on how well you perform the jump and the circumstances of the room itself. The higher Samus is when she unmorphs and presses B, the higher the jump will be.

Single BSJ (1BSJ)

Comparison of all types of BSJs. Blue = 1BSJ; Red = 3fBSJ; Yellow = 2BSJ; Green = 3BSJ.

A single BSJ, or 1BSJ, is the simplest form of BSJ. Naturally, there isn't much to it, but getting the optimal height entails performing the Instant Unmorph at around 16 frames in. The optimal height for this type of BSJ is 6.845 units.

3fBSJ

3fBSJ stands for 3 frame Bomb Space Jump. It refers to when two bombs are laid in the same place at once in a small amount of time, allowing the Morph Ball to get hit by all two of the bombs as it is first getting off of the ground. It provides more height than a single BSJ, but less height than a 2BSJ. As the name implies, the bombs must not be laid more than 3 frames apart to get the most out of this method, as the bombs will not be able to hit Samus otherwise. The optimal height for this type of BSJ is 8.268 units.

2BSJ

The 2BSJ is less precise and more efficient than the 3fBSJ. The second bomb should ideally be spaced in the middle of jumpstate 4 (around 10-11 frames in) to get the best possible height, but there is a decent amount of room to gain a significant amount of height over a 1BSJ, even if the bomb is placed suboptimally. The optimal height for this type of BSJ is 9.260 units.

3BSJ

The 3BSJ grants players the most height out of any standard BSJ. The setup for this type of BSJ is actually different between games, owing to the changes to the way bombs are programmed between Prime 1 and Echoes.

  • In Prime 1, performing a 3BSJ requires wasting an additional bomb beforehand, then waiting to lay the first bomb at the proper time such that the internal timer resets after it is laid.
  • In Echoes, you do not need to lay an additional bomb before performing a 3BSJ.

Naturally, performing a 3BSJ in Echoes is faster than performing a 3BSJ in Prime 1. Likewise, 3BSJs in Prime 1 are the slowest BSJ method. As such, they should only be performed in situations that require it for speedruns. Ideally, the bombs should be laid between 6-7 frames of eachother to get the most height out of this method. The optimal height for this type of BSJ is 10.1329 units.

4BSJ and beyond

In Prime 1, it is possible to have more than three active bombs at once. This has limited applications for BSJs in a TAS setting, as by this point the height gained by each individual bomb is starting to have diminishing returns. There is no current use for 4BSJs outside of TAS.

IUJ (Bombless BSJ)

As alluded to before, an Instant Unmorph Jump (or bombless BSJ) is the same thing as a BSJ, but it doesn't use bombs in order to get Samus into jumpstate 4. This can be done as Samus is getting repositioned Out of Bounds such as during the first stages of the Frigate Wallcrawl or Exo Skip, or by rolling Samus in such a way that she gets in the air, like in Central Station Access for certain low% categories.

Examples for Each Game

Bomb Space Jumps are used to differing degrees in each of the three games. This section highlights some notable examples for each game, showcasing various different types of BSJs for different rooms and situations.

Metroid Prime

Bomb Space Jumps have some significant use cases in Prime 1 speedruns, but as a whole they are not as common as they are in Echoes. They are mostly used for specific tricks where other standable collision cannot be used to climb a room.

Spiderless Shafts

In Elevator Access A, the first room for Spiderless Shafts, a 2BSJ is used in order to gain the height necessary for the first standable spot. This is required for the fastest any% routes.

Load video
YouTube

IUJ During Exo Skip

This is an example of an Instant Unmorph Jump in Prime 1, in the room Crater Tunnel B. When the Metroid repositions Samus out of bounds, she has a small window to Instant Unmorph and press B to jump. If successful, Samus will be able to stand on top of the door frame immediately, quickly allowing for the rest of the wallcrawl to be done without falling deep into Phazon Core.

Load video
YouTube

Metroid Prime 2: Echoes

BSJs are very commonly used in Echoes speedruns, having applications in various rooms throughout the game and finding uses in all major categories.

Alpha Blogg Skip

One of the best examples of BSJs in Echoes is in Main Hydrochamber, during the Alpha Blogg fight. Since Samus will have the Gravity Boost by this point, it's possible to perform a BSJ into a Gravity Boost to get enough height to reach the top of the room, skipping the Alpha Blogg fight.

Load video
YouTube

Temple Transport C/Transport C Access Transition

In any% runs, the fastest route involves getting a Secret World while the map is focused on Temple Transport C, and using an IUJ to transition to Transport C Access.

Load video
YouTube

IUJ in Low% Central Station Access

This is an example of an IUJ being used to traverse a room without the Space Jump Boots. Normally in Central Station Access, Samus will not be able to get the height necessary to jump onto the ledge without Space Jump. However, an IUJ can give just enough height to make it onto the ledge. This is done in certain low% categories.

Load video
YouTube

Metroid Prime 3: Corruption

Just like in Echoes, BSJs are also common in this game. BSJs in this game can be combined with Spring Ball. The initial bomb can be a Spring Ball instead. There are two BSJs used in Corruption:

  • Spring Space Jump (SSJ)
  • Two Bomb Space Jump (2BSJ)

Docking Bay Access

One of the first tricks in Corruption involves using a Spring Ball IUJ to quickly get onto the upper level in Docking Bay Access.

Load video
YouTube

See Also

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