Tetris Kiwamemichi (Arcade)

This page contains notes for the game Tetris Kiwamemichi (Arcade).

Dreamcast Build#

To obtain a playable GDI of the Dreamcast build, follow these steps:

1. Extract and decrypt TETRIS.BIN from the NAOMI GD-ROM using GD-ROM Explorer or another similar tool.
   • To convert a CHD to a GDI, obtain a copy of chdman from MAME, then run chdman extractcd -i gdl-0020.chd -o gdl-0020.gdi.
   • In GD-ROM Explorer, you can do this by right clicking the file, and clicking on the "Decrypt and Extract" option.
   • When asked for a DES key, use 62790B91859854C7.
2. With the decrypted binary, trim off the first 0x500 bytes (these belong to the NAOMI header).
   • Those with GNU coreutils available (e.g., from MSYS2) can just run something like tail -c+1281 TETRIS_DEC.BIN > track03.bin.
3. Make a copy of the NAOMI GDI and its first two tracks. These will be used as the base for the new Dreamcast GDI.
   • It will be assumed this is called disc.gdi.
4. Inside the newly copied GDI, make the line belonging to track 3 use 2048 sectors instead of 2352, and to use the file name of the track 3 you just obtained from the trimmed binary.
5. Now, we need to convert track 3 to use 2352 sectors instead of 2048. Obtain the command line version of Sappharad's GDIBuilder utility.
6. With buildgdi in the same folder as the new GDI, run buildgdi -extract -ip . -output data -gdi disc.gdi.
7. After the GDI has been extracted, run buildgdi -ip IP.BIN -data data -output . -gdi disc.gdi to replace track 3 with a newly created one that uses 2352 sectors.
8. Done! This GDI should run in Flycast and DEmul, however I have not yet heard test results on real hardware.