I use FB to find the .d64 file, do in it, select game, and click enter. Bottom of screen fills with stuff and then the black C64 screen. I then type sys 2064, get a bunch of stuff at the top and then a dead black screen. PAL/NTSC (my monitor can do PAL or NTSC, but the C64 is jumpered for NTSC (I think there may be a resistor change also to change it to PAL. Never the less, even as an NTSC C64, it should be doing something. I just got the SD2IEC, so I am still not sure how to use it yet. The only think I know so far is to LOAD"FB",8 then type RUN to use their file browser. I have Death Flood under a folder of its own and then the .d64 file under it. My apologies; it would be best to have a floppy, but I have no idea how to make a single sided 5.25" floppy. I do have the 1541 drives, but know way to download a file off the internet on my modern computer and make a 360K 5.25" floppy. I may be able to do a 3.5" floppy, using util software and a USB 3.5" floppy drive, but I do not have a commodore 3.5" drive. This is why I ordered a SD2IEC device. Maybe it is not a good solution either. So I am not sure what to do at this point.
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I wrote a small article today, where i describe how to get the game started on real hardware via disk or Sd2iec. You can find it here: https://www.windigo-design.de/wp_articles.html