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Bullet Bill spawner (55, rev. 20)
By  KingYoshi on 02-24-16, 04:32 pm
Category 'Enemies - Castle', known, fully documented
(no description)
Data files:
• /enemy/killer.nsmbd
Sprite fields:
Shooting behaviour: list at nybble 11: 0=Doesn't spawn,1=Fires at Mario,2=Fire from sprite placement
Maximum random up-shift: value at nybble 10. 0=1. The Bullet Bill, upon spawning, will shift up from a range of pixels between 1 and the value specified.
Enable Zone ID check: checkbox at nybble 7 with mask 1. If unchecked, the sprite spawns doesn't care if player is in the zone, and fires anyway.
Zone ID: value at nybble 8-9. Spawns from the right edge of screen when player is in zone.
Bullet Bill spawner (55, rev. 21)
By  Hiccup on 04-21-18, 10:55 am
Category 'Enemies - Castle', known, fully documented
(no description)
Data files:
• /enemy/killer.nsmbd
Sprite fields:
Shooting behaviour: list at nybble 11: 0=Doesn't spawn,1=Fires at Mario,2=Fire from sprite placement
Maximum random up-shift: value at nybble 10. 0=1. The Bullet Bill, upon spawning, will shift up from a range of pixels between 1 and the value specified.
Enable Zone ID check: checkbox at nybble 7 with mask 1. It seems like this must be enabled.
Zone ID: value at nybble 8-9. Spawns from the right edge of screen when player is in zone.