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SMM 2 > Save Data > My World

The page describes the content of the myworld.dat save data file in Super Mario Maker 2. The filesize is always 0x50000 bytes.

OffsetSizeDescription
0x00x10File header
0x100x4FFC0File body (encrypted)
0x4FFD00x30Crypto footer

Encryption

Details about the encryption algorithm are described here.

The following integer table is passed to the key generation algorithm:

table = [
    0xDFF6C33E, 0xB486C7E3, 0x1646D368, 0x567B75E6,
    0xC6D84AE7, 0xCA064CA8, 0x5B254E07, 0x81B3FE37,
    0x08ACAF1B, 0x14CD60EB, 0x5DC5946F, 0xEB8FBB88,
    0xD364B538, 0xA949551D, 0xDA4D7166, 0xEA0E87A7,
    0x89D053E1, 0x009D4895, 0xF86B9856, 0x2FE0C220,
    0x3C402325, 0x8659E43D, 0x87C3ED1A, 0xCBD7030C,
    0xCF396F99, 0x0DFD94DC, 0x84DDD433, 0xCF177DBF,
    0x88F6881C, 0x88DD889F, 0xF1206287, 0xE7DC7805,
    0xF50A2BC6, 0x6236A8BB, 0xDF39F5C5, 0xB57322CB,
    0xFAFD57F6, 0x289DFACC, 0x27FB583A, 0x0B8614EF,
    0xB4F88E08, 0x142D69DC, 0x226B96CF, 0x7C8A3FB5,
    0x8C0C9454, 0x3C64DE8A, 0x0C2E6E3F, 0xB295219F,
    0xE36F5007, 0x6D7E31B7, 0xAC1C2A3A, 0x5F97BED7,
    0x4E5E3DA0, 0x708CB046, 0x81FDC22E, 0x2D2BDEE6,
    0xE7165C54, 0x0C872B94, 0x7995D31C, 0x90FC391D,
    0x8F4096FA, 0x33D111B9, 0x5723F56C, 0x46AF2E44
]

File Header

The header is not encrypted.

OffsetSizeDescription
0x04Always 0
0x44Always 0
0x84Always 5
0xC4CRC-32 of decrypted file body

File Body

OffsetSizeDescription
0x00x4FFC0Unknown