Rocket Uppercut

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Performing a rocket uppercut in Forbidden Jungle near the Fisherman.

A rocket uppercut is a movement technique that propels Jak vertically while maintaining a grounded state. The technique has applications in many speedrun categories and is one of the key components in Lava Tube Skip. A rocket uppercut is performed by uppercutting into a small piece of vertically oriented ground collision. During the uppercut, Jak makes brief contact with the vertically oriented ground collision which sets him to a grounded state. This brief contact also amplifies the vertical momentum from the uppercut, similar to the amplified horizontal momentum of a boosted uppercut. The end result is Jak flying up into the air in a grounded state able to perform a limited amount of movement options before descending and entering his falling state.

Rocket uppercuts can also be performed by having cutscenes interrupting the uppercut instead of a grounded state, as seen in Yellow Vent Uppercut.

Technical

Explanation

Some textures within the game are programmed to have ground collision for walking on, such as grass and wooden planks. While these textures were intended for horizontally oriented use only, they were reused when designing vertically oriented landscape details, such as grass hanging off of a cliff. The wooden planks in Volcanic Crater are programmed with ground collision so Jak is able to walk on them, but this is the case for all sides of each plank, meaning Jak can get a grounded state from the top, sides, and bottom of each plank. Many oversights like this exist within the game.

Occurrences

Discovery

The rocket uppercut sometimes occurs during casual playthroughs so it is impossible to determine who first performed the trick. The first person to utilize a rocket uppercut in speedruns was Billbraid when performing an older variant of red sage cutscene skip.

Other Notes

Movement Techniques in the Jak and Daxter series
Jak and Daxter: The Precursor Legacy Boosted UppercutDirection Shift BoostedEco BoostExtended UppercutFall Damage Animation CancelFast SwimGround Cancel JumpIce MomentumInfinite BounceJump Pad One FrameJump Pad Hitbox ExtensionKuitar BounceLava WalkProxy JumpQuad JumpRocket UppercutScoutfly BoostedWater HopsWater Roll JumpWet FeetZoom Walk
Jak II AbahbounceBoosted UppercutExtended Uppercut (dark jak) • Fast SwimJetboard (extended frontflip, hover) • Proxy JumpRocket UppercutVehicle ClipVehicle FlingVehicle JumpVehicle SubstitutionWastelander MoveWater Roll Jump
Jak 3 AbahbounceBoosted UppercutConcussor Spin JumpExtended Uppercut (dark jak) • Fast SwimGlitch High JumpInfinite Flight GlitchJetboard (extended frontflip, hover) • Peace Maker LaunchProxy JumpRocket UppercutSpeed ZoomerVehicle ClipVehicle JumpVehicle SubstitutionWastelander MoveWater Roll JumpWave Concussor Infinite Jumps
Jak X placeholder text
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Jak and Daxter: The Lost Frontier placeholder text