Mod chips used to be necessary for playing games on CD-R, but now that can be done with just a 4-in-1 cartridge using the PseudoSaturn hack. My recollection is that Saturn mod chips only defeat the copy protection check and you’d still need another solution (like the 4-in-1 cart) for disabling the region-lock.
Congrats!! 🥳
No, really, I used to end with negative scores all. the. time. 😅