Mechanic · movement · metroidvania, platformer

Space Jump

An upgrade that lets a jump start again in midair when the press lands in a window of the fall.

stubAlso: space jump, infinite jumpUpdated 2026-10-21
On this page
  1. Related
  2. Games
  3. References
  4. Sources

The Space Jump turns a falling spin jump into a new jump. Metroid has none: its gear byte holds eight items, and none is a Space Jump1. In Metroid II a press restarts the jump only at 20 steps of the arc table’s fall2. Super Metroid tests the fall speed instead: a press jumps again while Samus falls at 2.5 px/frame or faster and below 53.

  • NoneMetroid (1986). The gear byte has no Space Jump bit.1
  • Window in the arcMetroid II: Return of Samus (1991). A new press restarts a spin jump during 20 entries of the arc's fall.2
  • Window of fall speedSuper Metroid (1994). A new press jumps again while the fall is between 2.5 and 5 px/frame.3

Builds on

See also

Mentioned in

Games

GameYearHowNote
Metroid II: Return of Samus1991Window in the arca new press restarts a spin jump during 20 entries of the arc's fall
Super Metroid1994Window of fall speeda new press jumps again while the fall is between 2.5 and 5 px/frame
Every claim about this mechanic, by game (3)
Metroid 1986Samus's gear byte, SamusGear, has one bit each for the bombs, High Jump, Long Beam, Screw Attack, Maru Mari, Varia, Wave Beam, and Ice Beam: all eight bits, none for a Space Jump.Code
Metroid II: Return of Samus 1991In a spin jump with the Space Jump, a new A press restarts the jump only on frames whose spaceJumpTable entry is nonzero: entries 44 to 63, where jumpArcTable falls 1 to 3 px a frame. The restart sets the counter to $28, or $18 with the Hi-Jump Boots, below $40, so a held A gives a new linear ascent.Code
Super Metroid 1994In a spin jump in air with the Space Jump, a new jump press makes a fresh jump only while Samus falls at 2.5 px/frame or faster and below 5.Code

References

  1. ^ abSamus's gear byte, SamusGear, has one bit each for the bombs, High Jump, Long Beam, Screw Attack, Maru Mari, Varia, Wave Beam, and Ice Beam: all eight bits, none for a Space Jump.Codenmikstas/metroid-disassembly
    How we know
    853;Bitmask defs used for SamusGear.
854.alias gr_BOMBS         $01
855.alias gr_HIGHJUMP      $02
856.alias gr_LONGBEAM      $04
857.alias gr_SCREWATTACK   $08
858.alias gr_MARUMARI      $10
859.alias gr_VARIA         $20
860.alias gr_WAVEBEAM      $40
861.alias gr_ICEBEAM       $80
    Source_Files/Metroid_Defines.asm lines 853–861 at 4270d57 · upstream ↗
    584.alias SamusGear        $6878   ;Stores power-up items Samus has.
    Source_Files/Metroid_Defines.asm line 584 at 4270d57 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-21.

    Checked by a second AI model, 2026-10-21.

    In the claim ledger

  2. ^ abIn a spin jump with the Space Jump, a new A press restarts the jump only on frames whose spaceJumpTable entry is nonzero: entries 44 to 63, where jumpArcTable falls 1 to 3 px a frame. The restart sets the counter to $28, or $18 with the Hi-Jump Boots, below $40, so a held A gives a new linear ascent.Codealex-west/M2RoS
    How we know
    4002; Space Jump Table
4003; - $00 means no space jumping on that frame
4004; - Non-zero values mean that you can space jump on that frame
⋮
4006spaceJumpTable: ;{ 00:1899
⋮
4009    db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $02, $01, $02, $02
4010    db $02, $02, $03, $02, $02, $03, $02, $02, $03, $02, $03, $02, $03, $02, $03, $02
4011    db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $80
    SRC/bank_000.asm lines 4002–4011 at 031aea3 · upstream ↗
    3997    db $00, $01, $01, $00, $01, $01, $01, $01, $01, $01, $02, $01, $02, $01, $02, $02
3998    db $02, $02, $03, $02, $02, $03, $02, $02, $03, $02, $03, $02, $03, $02, $03, $02
    SRC/bank_000.asm lines 3997–3998 at 031aea3 · upstream ↗
    4014poseFunc_spinJump: ;{ 00:18E8 - $02: Spin jumping
⋮
4016    ldh a, [hInputRisingEdge]
⋮
4023    ; If jump timer is > $40, then jump ahead
4024    ld a, [samus_jumpArcCounter]
4025    cp samus_jumpArrayBaseOffset
4026    jr nc, .endIf_B
4027        ; Handle linear ascent of the jump
⋮
4030        bit PADB_A, a
⋮
4034            ld a, [samusItems]
⋮
4053    ; Skip ahead if not holding jump
4054    ldh a, [hInputRisingEdge]
4055    bit PADB_A, a
⋮
    SRC/bank_000.asm lines 4014–4078 at 031aea3 · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-21.

    Checked by a second AI model, 2026-10-21.

    In the claim ledger

  3. ^ abIn a spin jump in air with the Space Jump, a new jump press makes a fresh jump only while Samus falls at 2.5 px/frame or faster and below 5.CodeInsaneFirebat/sm_disassemblyrevised
    How we know
    5467SamusMovement_SpinJumping:
5468; Handles space jump
⋮
5513  .spaceJumpEligible:
⋮
5526  .airPhysics:
    src/bank_90.asm lines 5467–5540 at 7af131e · upstream ↗
    5056  .SpaceJumpMinimumYVelocityInAir:
5057; Space jump minimum Y velocity in air * 100h
⋮
5061; Space jump maximum Y velocity in air * 100h
    src/bank_90.asm lines 5056–5062 at 7af131e · upstream ↗

    Checked against the evidence by its author, an AI model, 2026-10-21.

    Revised after a check by a second AI model, 2026-10-21.

    In the claim ledger

Sources

Code