At ROM offset 0x8013C and RAM address 0x8007F53C is an array of level information structures.

// 0x54 bytes in size
struct LevelInfo {
   /* 0x00 */ char* internal_name;
   /* 0x04 */ s16 level_title_text_id;
   /* 0x06 */ s16 channel_title_1_text_id;
   /* 0x08 */ s16 channel_title_2_text_id;
   /* 0x0C */ s16 tv_channel_img_id; // Used in hub areas. 0x06 = Snow, 0x05 = Mystery, etc.
   /* 0x0E */ s16 mission_1_text_id;
   /* 0x10 */ s16 mission_2_text_id;
   /* 0x12 */ s16 mission_3_text_id;
   /* 0x14 */ s32 unk_14;
   /* 0x18 */ s32 unk_18;
   /* 0x1C */ u32 rom_offset_to_compressed_level_data_start;
   /* 0x20 */ u32 rom_offset_to_compressed_level_data_end;
   /* 0x24 */ u32 unk24_rom_offset_to_asm;
   /* 0x28 */ u32 unk28_rom_offset_to_asm;
   /* 0x2C */ s32* unk2C_ptr;
   /* 0x30 */ s32* unk30_ptr;
   /* 0x34 */ s32 unk_34;
   /* 0x38 */ u32 unk38_rom_offset;
   /* 0x3C */ u32 rom_offset_to_channel_ci4_texture;
   /* 0x40 */ u32 rom_offset_to_N64WaveTables;
   /* 0x44 */ u32 rom_offset_to_N64PtrTablesV2;
   /* 0x48 */ u32 unk48_rom_offset;
   /* 0x4C */ u32 unk4C_rom_offset_to_compressed_data;
   /* 0x50 */ u32 unk50_rom_offset_to_compressed_data;
}