BG2 Strings for GoldenEgg - brunovalads/yoshisisland-disassembly GitHub Wiki
Layer 2 Background Settings
Cave Waterfall
BG2 Image: 00
BG2 Palettes: 20, 21
Palette Animation Required: 0E, 11, 13, 14

Woods
BG2 Image: 01
BG2 Palettes: 01, 16, 17, 1C

Palettes 16 and 17 are identical.
Pond
BG2 Image: 02
BG2 Object Palette: 02

3D Stone & Lava
BG2 Image: 03
BG1 Tileset: 03
BG1 Palette: 03

This is the only background that requires a specific BG1 tileset and BG1 palette.
Forest and Mountains
BG2 Image: 04
BG2 Palettes: 03, 04, 25, 26

Forest
BG2 Image: 05
BG2 Object Palette: 05

Castle, Watercourse and Candles
BG2 Image: 06
BG2 Object Palette: 06
Palette Animation Required: 03

Tropical Mountains
BG2 Image: 07
BG2 Object Palette: 07

Forest
BG2 Image: 08
BG2 Palettes: 08, 24

Jungle Mountains
BG2 Image: 09, 10
BG2 Palettes: 09, 10, 2C, 2D

Images 09 and 10 are identical, and the same goes for the palettes that match these values.
Waterfall
BG2 Image: 0A
BG2 Palettes: 0A, 30
Palette Animation Required: 04

Distant Grounds
BG2 Image: 0B
BG2 Object Palette: 0B, 31
Header Animation Required: 02, 0B

Boogy Woods
BG2 Image: 0C
BG2 Object Palette: 0C

Night Sky
BG2 Image: 0D
BG2 Object Palette: 28

Incompatible with animations because garbage will be among the stars when used.
Grass
BG2 Image: 0E
BG2 Palettes: 0E, 1E, 2E

Volcano
BG2 Image: 0F
BG2 Object Palette: 0F
Header Animation Required: 02, 0B

Ocean
BG2 Image: 12
BG2 Object Palette: 12, 28, 29, 2A

Cave Crystals
BG2 Image: 13
BG2 Object Palette: 13
Palette Animation (Optional): 05, 06, 10, 12

Castle Webs
BG2 Image: 14
BG2 Palettes: 14, 2F

Sky Mountains
BG2 Image: 15, 1A
BG2 Palettes: 15, 20

Image 15 has low mountains, 1A has high mountains.
Forest, Eerie Cave
BG2 Image: 18
BG2 Object Palette: 18

Castle Stones
BG2 Image: 19
BG2 Palettes: 00, 2B

None
BG2 Image: 1B
BG2 Object Palette: 19

These settings are used for sewer levels without a background.
Smiley Mountains
BG2 Image: 1C
BG2 Object Palette: 1A

Round Mountains
BG2 Image: 1D
BG2 Palettes: 1B, 22, 27
Header Animation Required: 00, 02, 0B

Forest
BG2 Image: 1E
BG2 Object Palette: 1D, 23

Baby Bowser's Room
BG2 Image: 1F
BG2 Palette: 1F

Palette for when the lights come on still unknown (probably only triggereable with Baby Bowser)
Based on Mattrizzle's sheet