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''See also: [[List of Major BLJ Locations]]''
The '''Backwards Long Jump''', or '''BLJ''' for short, is one of the most well-known and versatile methods of gaining [[Hyperspeed]], whereby Mario's backwards speed can increase under certain conditions during a backwards-facing [[Long Jump]].


The '''Backwards Long Jump''' (or '''BLJ''' for short) is one of the most versatile hyperspeed methods, done by long jumping backwards. It is the result of a minor oversight by the game's programmers/developers: There is no reasonable limit on Mario's speed when it becomes negative during a long jump. Therefore, by long jumping backwards in a position where you can continue to long jump backwards every few frames, you can achieve negative hyperspeed. BLJs can be done on certain slopes, stairways, and obstacles. To perform a BLJ, do a long jump with Mario facing away from the obstacle/stairway/slope but move backwards towards it (by holding the joystick in the opposite direction). Mario will collide with the obstacle/stairway/slope, leaving him on the ground and enabling him to backwards long jump again. Mario's speed becomes negative at this point, and BLJing repeatedly causes a negative speed increase of approximately 45-50% of Mario's currently stored speed at that time. Once the desired speed is reached, simply stop BLJing and Mario will zoom off backwards at an incredibly high speed. If you continue BLJing long enough, Mario's speed, stored in a float, will eventually reach -229399772256808620000000000000000000000, then tick over to -1.#INF, and crash the game.
This [[Glitch|glitch]] is caused by the lack of a negative limit on Mario's speed. The first frame of a Long Jump multiplies Mario's forward velocity by 1.5, and although the game keeps this velocity below 48.0, no corresponding negative cap is enforced. Since Mario's speed is slowed due to drag each frame he is in the air, this multiplier does not affect typical gameplay. However, if Mario is in a position where he can perform many backwards-facing Long Jumps in rapid succession, he can repeatedly reduce his speed while overcoming drag, resulting in negative Hyperspeed.  
 
BLJs can be performed on [[List of Major BLJ Locations|many slopes, stairways, and obstacles]], making it useful for [[Speedrun|speedruns]] and [[Challenge|challenges]] alike.
 
== Execution ==
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To perform a BLJ, do a long jump with Mario facing away from the obstacle/stairway/slope but move backwards towards it (by holding the joystick in the opposite direction). Mario will collide with the obstacle/stairway/slope, leaving him on the ground and enabling him to backwards long jump again. Mario's speed becomes negative at this point, and BLJing repeatedly causes a negative speed increase of approximately 45-50% of Mario's currently stored speed at that time. Once the desired speed is reached, simply stop BLJing and Mario will zoom off backwards at an incredibly high speed. If you continue BLJing long enough, Mario's speed, stored in a float, will eventually reach -229399772256808620000000000000000000000, then tick over to -1.#INF, and crash the game.


The key aspect of BLJs is Mario's capability of retaining negative speed temporarily. Eventually, the speed will increase back to 0; however, there are a few frames within a BLJ in which his speed doesn't deplete instantly. These frames allow for repeated BLJs, thus increasing his speed.
The key aspect of BLJs is Mario's capability of retaining negative speed temporarily. Eventually, the speed will increase back to 0; however, there are a few frames within a BLJ in which his speed doesn't deplete instantly. These frames allow for repeated BLJs, thus increasing his speed.
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* Go into [[Parallel Universe|Parallel Universes]]
* Go into [[Parallel Universe|Parallel Universes]]


 
== Types of BLJs ==
 
=== Types of BLJs ===


While all BLJs work by the same principle, there are many different methods of performing them. There are numerous places where a BLJ can be performed throughout the game (virtually every level contains at least one), and it is unlikely that all such locations have been discovered.
While all BLJs work by the same principle, there are many different methods of performing them. There are numerous places where a BLJ can be performed throughout the game (virtually every level contains at least one), and it is unlikely that all such locations have been discovered.


 
=== Stair BLJ ===
==== Stair BLJ ====
Stair BLJs were the first kind of BLJs to be discovered. A Stair BLJ consists of long jumping backwards onto stairs, which are basically tiny floors, which Mario can run directly over. BLJing on stairs works similar to Elevator BLJs because they both consist of Mario's jumps being interrupted allowing for more jumps to be performed, however the timing must be precise.
Stair BLJs were the first kind of BLJs to be discovered. A Stair BLJ consists of long jumping backwards onto stairs, which are basically tiny floors, which Mario can run directly over. BLJing on stairs works similar to Elevator BLJs because they both consist of Mario's jumps being interrupted allowing for more jumps to be performed, however the timing must be precise.


Here's how they work: With a precisely timed BLJ, Mario's vertical position snaps to the next highest stair, ultimately reducing Mario's vertical speed to 0 (allowing him to repeatedly BLJ on the ground). When this occurs, his negative horizontal speed is temporarily stored, allowing him to repeat the process which results in a greater amount of negative speed.
Here's how they work: With a precisely timed BLJ, Mario's vertical position snaps to the next highest stair, ultimately reducing Mario's vertical speed to 0 (allowing him to repeatedly BLJ on the ground). When this occurs, his negative horizontal speed is temporarily stored, allowing him to repeat the process which results in a greater amount of negative speed.


 
=== Slope BLJ ===
==== Slope BLJ ====
Slope BLJs are backwards long jumps on steep slopes. To find slopes with this property, locate slopes that permit Mario to stand perfectly still on them. He will not slide off of them.
Slope BLJs are backwards long jumps on steep slopes. To find slopes with this property, locate slopes that permit Mario to stand perfectly still on them. He will not slide off of them.


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A common slope to BLJ on would be the slopes on the Castle Roof or the tan-colored slopes located by the cannon in the castle grounds.
A common slope to BLJ on would be the slopes on the Castle Roof or the tan-colored slopes located by the cannon in the castle grounds.


 
=== Elevator BLJ ===
==== Elevator BLJ ====
Elevator BLJs are performed on elevators, but not every elevator permits an elevator BLJ!
Elevator BLJs are performed on elevators, but not every elevator permits an elevator BLJ!


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The elevators in Hazy Maze Cave and Bob-omb Battlefield are good places to practice. Elevators that move in a horizontal fashion, such as the ones located in the volcano of Lethal Lava Land, do not have the properties to initiate Elevator BLJs because they do not have enough vertical velocity.
The elevators in Hazy Maze Cave and Bob-omb Battlefield are good places to practice. Elevators that move in a horizontal fashion, such as the ones located in the volcano of Lethal Lava Land, do not have the properties to initiate Elevator BLJs because they do not have enough vertical velocity.


 
=== Low Ceiling BLJ ===
==== Low Ceiling BLJ ====
These are probably the trickiest locations to find because some of them are invisible or are just plain easy to overlook. However, walls above a floor can also act like ceilings. These walls don't necessarily have to be parallel with the ground in order for a Low Ceiling BLJ to be performed.
These are probably the trickiest locations to find because some of them are invisible or are just plain easy to overlook. However, walls above a floor can also act like ceilings. These walls don't necessarily have to be parallel with the ground in order for a Low Ceiling BLJ to be performed.


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The most common Low Ceiling BLJ is the one presented in the video (located in the Jolly Roger Bay room). Both of the Lobby BLJs in the main room of the castle are also Low Ceiling BLJs, but they utilize Invisible Wall Hitboxes which act as Low Ceilings.
The most common Low Ceiling BLJ is the one presented in the video (located in the Jolly Roger Bay room). Both of the Lobby BLJs in the main room of the castle are also Low Ceiling BLJs, but they utilize Invisible Wall Hitboxes which act as Low Ceilings.


 
=== Side BLJ ===
==== Side BLJ ====
Side BLJs are very similar to stair BLJs, since both utilize the vertical position snapping mechanic in the game (mentioned earlier in Stair BLJs). A Side BLJ essentially consists of Mario repeatedly BLJing onto and off of a floor.
Side BLJs are very similar to stair BLJs, since both utilize the vertical position snapping mechanic in the game (mentioned earlier in Stair BLJs). A Side BLJ essentially consists of Mario repeatedly BLJing onto and off of a floor.


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Side BLJs can be performed on most stairs (due to some stairs having the appearance of stairs but are actually steep slopes) and on flat platforms which Mario can run directly over.
Side BLJs can be performed on most stairs (due to some stairs having the appearance of stairs but are actually steep slopes) and on flat platforms which Mario can run directly over.


 
=== Pause BLJ ===
==== Pause BLJ ====
''See also [[Pause-buffering]]''
''See also [[Pause-buffering]]''


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