I imaged a loose MSX cassette titled `倉庫番ツールキット` (Soukoban Toolkit) - an add-on tape containing the ASCII's Japanese release of the Soukoban Power Up level editor enhancement by Seiji Nishikawa and 41 new level patterns for ASCII's Soukoban game. I was able to use it with the version of Soukoban I extracted from my ASCII ROM cartridge. Both sides contained the same data, but in different orders: on Side A the Soukoban Power Up program was first (loaded in three chunks) followed by new patterns 01-20, then new patterns 21-30, and finally new patterns 31-41; on Side B the new patterns came first with the Soukoban Power Up program at the end (again in three chunks). For all the included data the loading method is the same: after the Soukoban title sequence, select Edit and then Load, and play the tape. I have not found another description of the software on this add-on tape. The code `ADX024L07` is stamped on the spine of the cassette and may be a media serial number of some kind. Since I don't have any of the accompanying documentation I'm not sure what changes Soukoban Power Up brings to the level editor, but at the very least it does change the color of the status bar in test mode to a lighter shade of blue.

ROM cartridge I used this tape's contents with:
```
16K Soukoban (Japan).rom crc32:030ddf11 md5:4b73979eae8b309294caec36f2510965 sha1:04bd78730b100dd879e2fbd3fe646d2bc9bbc46b sha256:9043f27ed99f785ba58f91f219806251718c7a41627066b61f882e07106993e7 size:16384
```
CAS image fingerprint for the software found on both sides:
```
1.2K Soukoban - New Patterns 01-20 (File 01) (Side B) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:4902a2b9 md5:58a2019675062d0869e631a13f467bb3 sha1:a17397427b813c472f67fc142388f1c717083479 sha256:05518a055a53ff758fc57fa34f02a5b4f2677bbc81ddf4504a6977844553acae size:1171

1.2K Soukoban - New Patterns 01-20 (File 02) (Side A) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:4902a2b9 md5:58a2019675062d0869e631a13f467bb3 sha1:a17397427b813c472f67fc142388f1c717083479 sha256:05518a055a53ff758fc57fa34f02a5b4f2677bbc81ddf4504a6977844553acae size:1171

745 Soukoban - New Patterns 21-30 (File 02) (Side B) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:c9b48029 md5:9c5e8f4efe54dd4c92d55dd8e859097e sha1:bc96791c04c4e86c68c3581731f6e86bd0c6bd28 sha256:37fa1765dcedaf80b424b0c0eb5e5ebcd96681198cf9bf87f9f55f4473dd66db size:745

745 Soukoban - New Patterns 21-30 (File 03) (Side A) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:c9b48029 md5:9c5e8f4efe54dd4c92d55dd8e859097e sha1:bc96791c04c4e86c68c3581731f6e86bd0c6bd28 sha256:37fa1765dcedaf80b424b0c0eb5e5ebcd96681198cf9bf87f9f55f4473dd66db size:745

752 Soukoban - New Patterns 31-41 (File 03) (Side B) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:6095b37e md5:208ec11810d09908cf6670bdbb198ea9 sha1:cdd5f7afd7ef6c8bc4e783341c3eb0b8c82e0cdc sha256:5492fc64b97b5b07fcec6ae3895c02bbddbc4e7a2dc609817dace639409efda8 size:752

752 Soukoban - New Patterns 31-41 (File 04) (Side A) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:6095b37e md5:208ec11810d09908cf6670bdbb198ea9 sha1:cdd5f7afd7ef6c8bc4e783341c3eb0b8c82e0cdc sha256:5492fc64b97b5b07fcec6ae3895c02bbddbc4e7a2dc609817dace639409efda8 size:752

3.0K Soukoban Power Up (File 01) (Side A) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:d98ccbcb md5:c8a88d8abe3fd8818af03ebb5bed179a sha1:6f9524e399c53b5db5dc367f249de7e6c440501e sha256:3e0e0ac21dc3b148d10ecb5793169872efb6f87760e45610e25bda9eb4a42287 size:2985

3.0K Soukoban Power Up (File 04) (Side B) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:d98ccbcb md5:c8a88d8abe3fd8818af03ebb5bed179a sha1:6f9524e399c53b5db5dc367f249de7e6c440501e sha256:3e0e0ac21dc3b148d10ecb5793169872efb6f87760e45610e25bda9eb4a42287 size:2985

5.6K Soukoban Toolkit (Side A) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:5639903e md5:fb14c494e0a123370afeaab61e7c2934 sha1:55ed4045b426d6cb57117ebc353229af1263e78a sha256:9ffd4effc15e3aa0598fae98bb1d2dfa5acfb3afd897e98d13b00e03debccf00 size:5653

5.6K Soukoban Toolkit (Side B) (ASCII) (Japan) [ROM+CAS] [Edit-Load] [_].cas crc32:bb780e90 md5:3be886b5d33d8ade93eaff2c0b632148 sha1:de89c8f8966e8aaa18aa4b5814653324cdc35c33 sha256:6d17cf42b120244143535f64a134553cc0246e0b579e473cadf2c1348e6497aa size:5653
```
Raw 24-bit stereo 44100 Hz FLAC audio was imaged using a Nakamichi BX-125 tape deck and a Steinberg UR22mkII USB ADC with Audacity under Win11 and is intended to be archival, CAS is for emulator use, and WAV is regenerated from CAS for the benefit of an actual MSX. Short filenames and long ones contain the same data.
