Lets Samus keep her momentum when landing from a fall or from jumping. By default, you must be spin jumping, running, and have speed booster equipped to keep momentum when landing, but with this patch it is very easy to remove any or all of these requirements. Please see the instructions in the .asm file.

Note: The original speedkeep patch was based on a hex tweak found by DSO and Rakki, which had a glitch which was fixed by cauuyjdp with help from PJBoy's docs, uploaded by MetroidNerd#9001. This current version, which is simpler, more customizable, and uses roughly the same amount of space, was rewritten by Scyzer, with further bugfixes and notes added by Nodever2 as of 5-15-2022. It has since been updated with a fix for a glitch where Samus becomes stuck when grappling an enemy when this patch is applied on 6-26-2023 by OmegaDragnet7. Thanks to all who were involved.