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Bowser Jr. boss (220, rev. 3)
By  gridatttack on 08-30-13, 04:56 am
Category 'Bosses and cutscenes', known
The unknown option has something to do that enables Bowser jr. to have collision with sprites, like the pendulum platform and draw bridge.
Otherwise, it will simply ignore such sprites.
Data files:
• /enemy/koopa_jr.nsbmd
Sprite fields:
Behavior: list at nybble 10: 0=Throws shells,1=Hops in shell after damage,2=Hops in shell after damage,3=Throws shells
Speed progression: list at nybble 9: 0=slow slow med,1=slow med med,2=slow med fast
Unknown 11: list at nybble 11: 0=Unknown Option A,1=Unknown Option B,2=Unknown Option C,3=Unknown Option D
Bowser Jr. boss (220, rev. 4)
By  MeroMero on 08-31-13, 10:00 am
Category 'Bosses and cutscenes', known
The unknown option has something to do that enables Bowser jr. to have collision with sprites, like the pendulum platform and draw bridge.
Otherwise, it will simply ignore such sprites.
Data files:
• /enemy/koopa_jr.nsbmd
Sprite fields:
Unknown 2: checkbox at nybble 2 with mask 1. To use with nybble3. If both nybble2 and nybble3 are different from 0, Bowser Jr. will stay idle until you stomp him once, then will resume the battle as it normally should.
Unknown 3: checkbox at nybble 3 with mask 1. To use with nybble2. If both nybble2 and nybble3 are different from 0, Bowser Jr. will stay idle until you stomp him once, then will resume the battle as it normally should.
Battle mode: list at nybble 5: 0=Tower battle,1=Final boss battle. If final boss battle is chosen, Bowser Jr. will have the same "death" as in the final boss battle.
Unknown 7: value at nybble 7. Used in-game. Unknown effect.
Speed progression: list at nybble 9: 0=slow slow med,1=slow med med,2=slow med fast
Behavior: list at nybble 10: 0=Throws shells,1=Hops in shell after damage,2=Hops in shell after damage,3=Throws shells
Unknown 11: list at nybble 11: 0=Unknown Option A,1=Unknown Option B,2=Unknown Option C,3=Unknown Option D