(level headers are 10 bytes long, and use nybbles for stuff. not bytes)<br>
Nybble 1: Background Color<br> 
Nybble 2: Foreground Tileset<br> 
Nybble 3: Foreground Color<br> 
Nybble 4: Background Tileset<br> 
Nybble 5/6: Background (see bottom)<br> 
Nybble 7/8: Layer 3 stuff<br> 
Nybble 9: Layer 3 color<br> 
Nybble 10: Primary spriteset<br> 
Nybble 11/12: Secondary spriteset<br> 
Nybble 13/14: Layer settings<br> 
Nybble 15: Layer 3 tileset<br> 
Nybble 16: Shiny settings<br> 
Nybble 17: Scrolling<br> 
Nybble 18: Music<br> 
Nybble 19/20: Music bank?<br> 
Offsets:<br>
0x006DD4: 2-8<br>
0x006EA1: 2-8 (Part 2 out of 3)<br>
0x087462: 5-7<br>
0x08CC20: 1-6<br>
0x08D5FA: 3-4<br>
0x08F5E9: 6-Extra<br>
0x09491F: 1-7<br>
0x095220: 2-1<br>
0x095C82: 2-Extra<br>
0x095E55: 2-Extra (bonus room)<br>
0x095FF7: 4-4<br>
0x096DA0: 5-6<br>
0x097264: 5-Extra<br>
0x097AC7: 6-3<br>
0x097CEB: 6-3 (Part 2)<br>
0x0A0200: 1-4<br>
0x0A09D4: 2-2<br>
0x0A180E: 2-7<br>
0x0A27BC: 3-1<br>
0x0A30A8: 3-2<br>
0x0A343B: 3-3<br>
0x0A3F23: 3-8<br>
0x0A3F91: 3-8 (Interior)<br>
0x0A4728: 3-8 (Second Part)<br>
0x0A4911: 4-1<br>
0x0A5688: 4-2<br>
0x0A56CA: 4-2 (Underground)<br>
0x0A6235: 4-5<br>
0x0A6B20: 5-2<br>
0x0A6C82: 5-2 (Part 2)<br>
0x0A6DEC: 5-2 (Part 3)<br>
0x0A733E: 6-7<br>
0x0A8200: 1-8 (part 2 and secret room)<br>
0x0A896C: 2-3<br>
0x0A95F5: 2-4<br>
0x0AA11A: 2-5<br>
0x0AAF93: 2-6<br>
0x0ABC64: 3-5<br>
0x0AC507: 3-Extra<br>
0x0AC79E: 4-3<br>
0x0ACE16: 5-1<br>
0x0ADB0D: 5-3<br>
0x0AEAE3: 6-2<br>
0x0AF396: 6-8<br>
0x0AF4E7: 6-8 (Pick a Door)<br>
0x0AFBB2: 6-8 (Tap-tap's Cavern)<br>
0x0B0242: Intro Stage<br>
0x0B03C7: 1-1<br>
0x0B0871: 1-3<br>
0x0B13D5: 1-Extra<br>
0x0B173D: 3-6<br>
0x0B17D4: 3-6 Underground<br>
0x0B217F: 3-7<br>
0x0B2348: 3-7 (Second Part)<br>
0x0B2B98: 4-6<br>
0x0B2B98: 4-7(WHY IS THIS AND 4-6 THE SAME?!)<br>
0x0B3782: 4-8<br>
0x0B437D: 5-4<br>
0x0B4FF5: 5-5<br>
0x0B72FE: 6-5<br>
0x0CE2A2: 1-2<br>
0x0CECCA: 4-Extra<br>
0x0CF6D9: 6-4<br>
0x11446D: 1-5<br>
0x1147A0: 6-6<br>

If the ground color has a setting of:<br> 
X0, X4, X8, or XC:<br> 
00: Lava (or waterfall, depending on layer 3) flowing down<br> 
20: Trees and bushes<br> 
40: Forest with plants<br> 
60: See above but this time, it's mushrooms<br> 
80: Hummoks and faded trees<br> 
A0: Trees below the horizon<br> 
C0: Sewers<br> 
E0: Plains<br> 
X1, X5, X9, or :<br> 
00: Trees (upclose)<br> 
20: Helicopter view of mountains and forests<br> 
40: Paradise and Waterfalls<br> 
60: Chomp Land<br> 
80: Similar X0, X4, X8, and XC's 20, it has thicker wood and more detailed bushes<br> 
A0: Stars<br> 
C0: Chomp Land (again)<br> 
E0: Trees (as if you were right infront of it)<br> 
X2, X6, XA, or XE:<br> 
00: See X1 20<br> 
20: Possibly Castles<br> 
40: Overhead View of the Ocean<br> 
60: Looks like a grave yard...<br> 
80: Castle<br> 
A0: Mountains<br> 
C0: Dark, I think it's used for Bowser's Fight<br> 
E0: Weird...<br> 
X3, X7, XB, or XF:<br> 
00: Jungle<br> 
20: Castle<br> 
40: Mountains<br> 
60: Colors<br> 
80: Plains<br> 
A0: Hills<br> 
C0: Woods<br> 
E0: Bowser's Room<br> 

<br>
X0, X4, X8, or XC and Layer 3 > 80<br> 
0F: Lava Falls<br> 
20: Bushes<br> 
CE: Sewers<br> 
AD: Green Trees Below Horizon<br> 
X0, X4, X8, or XC and < 80<br> 
0B: Waterfalls<br> 
0C: Purple Salactites<br> 
10: Waterfalls<br> 
82: Hummoks and Trees<br> 
93: Dark Hummocks and Trees<br> 
X1, X5, X9, or  and > 80<br> 
E7: Volcano<br> 
X1, X5, X9, or  and < 80<br> 
04: Green Trees<br> 
12: Autumn Trees<br> 
B4: Stars<br> 
C7: Chomp's Plateau<br> 
X2, X6, XA, or XE and > 80<br> 
54: Nighttime Ocean<br> 
69: Graveyard<br> 
AA: Mountains<br> 
X2, X6, XA, or XE and < 80<br> 
16: Helicopter View<br> 
49: Ocean (light blue)<br> 
B0: Mountains (chocolate)<br> 
X3, X7, XB, or XF and > 80<br> 
0C: Jungle<br> 
35: Castle Stone Walls<br> 
4A: Tall Moutains<br> 
A3: Light Green Hills<br> 
A9: Dark Green Hills<br> 
AD: Green Hills<br> 
B6: Chocolate Hills<br> 
CE: Autumn Trees<br> 
D1: Blue Trees<br> 
EF: Dark Bowser Room<br> 
X3, X7, XB, or XF and < 80<br> 
8D: Colored Plains<br> 
B1: Ice Plains<br>