Beatmania Best Hits

Beatmania Best Hits allows you to smash buttons and spin a plastic wheel as you pretend to be an awesome DJ in your own living room. It was also the first of the franchise's PlayStation home ports to do away with the "Append Disc" system, so you didn't have to use the original Beatmania disc to play the included songs.

Beatmania APPEND 5th Mix Source Code
The "DUMMY" file on the disc contains a near-final source code archive for Beatmania APPEND 5th Mix, plus instructions (in Japanese) on how to compile the code. The source can be compiled into a working game image with the proper file and directory modifications. To open it, copy the file to your computer, rename it to add a .LZH extension, and open it with your favorite file compression tool.

The "DUMMY" file is still present in the "Konami The BEST" rerelease (SLPM-86830), but it now contains garbage data.