MM5 falling off the front of an arrow

[Forum post from 2015]

The memory addresses the game uses for miscellaneous weapon data affect your falling speed while you're standing on an arrow. Falling off the front of the arrow happens when this value is low enough to drop you far enough that the arrow no longer clips you back. Positive values seem to have no effect on using arrows.

The memory addresses in question are 03F1, 03F2, and 03F3. There are three known things that write negative values to them, and they remain until you use one of the weapons that write something else there. Power Stone clears all three values, which is why you don't see the glitch after Charge Man stage.


Water Wave:
Uses the addresses for the vertical speeds of each of the three water spouts.

How to avoid:
You shouldn't be using this weapon anywhere it could run off a ledge.


Napalm Bomb:
Uses the addresses for the vertical speeds of each of the three bombs on screen. The first bomb corresponds to the first arrow, second bomb to second arrow, third bomb to third arrow.

How to avoid:
This comes up if you hit Stone Man with bombs that are falling at a high enough speed. If you don't miss any shots, only the value for the first arrow will be suspect. If you fire another while one bomb is on screen already, the second bomb will affect the value for second arrow. If you notice the last bomb that affects either value (or every run just in case), you can fire new bombs right before the fanfare - bombs fired while standing on steady ground won't produce problematic values. Do note that this can cause lag if there are enough boss explosion bubbles on screen. Firing two bombs should be safe with about 5-6 remaining.


Proto man:
In the intro video, the address for the second projectile is used for Proto Man's vertical speed in the scene where he grabs Dr Light and jumps away, and leaves a value that will fuck up your second arrows.

How to avoid:
After each reset, start the game before letting the intro video run up to that point.


You could actually utilize the last one to drop off of the arrow over the turrets in Gravity faster. The first opportunity in the run where you could reset the address is with the fragments of Crystal Eye, which you could create after killing Napalm Man (or you could use Napalm in Stone fight since you don't need to run on a #2 arrow in Stone). The only time you're supposed to run on a second arrow before this is in Napalm cave section, where you could place an extra arrow and run on the third one to avoid this. I haven't timed whether this would be worth it, but I will go ahead and just assume it wouldn't be because that would be the dumbest thing.