##### Default terrains
background table at 0x24ee34

TERRAIN_GRASS (0):
background: 1 grass.png
map type: all
behavior: 2 and 209

TERRAIN_LONG_GRASS (1):
Unusable (no assigned behavior)

TERRAIN_SAND (2):
background: 3 desert.png
map type: all
behavior: 33 and 23

TERRAIN_UNDERWATER (3):
background: default
map type: underwater (5)
behavior: all

TERRAIN_WATER (4):
background: 5 sea.png
map type: not indoor (8), underground (4), secret base (9) or underwater (5)
behavior: 17, 18 and 21
(on map type 6, this is used for every surfable tile, not just ocean tiles)

TERRAIN_POND (5):
background: default
map type: not indoor (8), secret base (9), underwater (5) or type 6
behavior: every surfable tile

TERRAIN_ROCK (6):
background: 11 mountain.png
map type: not indoor (8), underground (4), secret base (9), underwater (5) or type 6
behavior: 12

TERRAIN_CAVE (7):
background: 8 cave.png
map type: underground (4)
behavior: not 11 or surfable

TERRAIN_BUILDING (8):
background: default
map type: indoor (8) or secret base (9)
behavior: all
(on underground (4), this is used for behavior 11)

TERRAIN_PLAIN (9):
backround: default
Fallback when everything else fails.

##### Non-default terrains
TERRAIN_HINTERLAND (20):
background: 2 hinterland.png
secret power: cause freeze
nature power: blizzard
camouflage: ice

TERRAIN_JUNGLE (21):
background: 4 jungle.png
secret power: cause sleep
nature power: razor leaf
camouflage: grass

TERRAIN_BEACH (22):
background: 6 beach.png
secret power: lower acc by 1 stage
nature power: mud shot
camouflage: ground

TERRAIN_VOLCANO (23):
background: 7 volcano.png
secret power: cause burn
nature power: heat wave
camouflage: fire

TERRAIN_SAVANNAH (24):
background: 9 savannah.png
secret power: lower special attack
nature power: grass whistle
camouflage: grass

TERRAIN_PINK_ROOM (25):
background: 10 pink room.png
secret power: cause paralysis
nature power: swift
camouflage: normal

TERRAIN_FACTORY (26):
background: 12 factory.png
secret power: lower special defense
nature power: sludge bomb
camouflage: poison