A Fan Mod Puts the Sega Saturn's Extra Castle Areas and a Playable Maria Into the PlayStation's Castlevania: Symphony of the Night, All on One CD-R

Chris Pirillo drawn as a mid-1990s game character in a long burgundy coat, holding up a shiny blank CD beside an open gray PlayStation on the rim of a stone fountain in a moonlit castle hedge garden — Illustration: LockerGnome

Symphony of the Night came out three ways. The PlayStation original shipped in 1997. The Japanese Saturn version, Akumajou Dracula X: Gekka no Yasoukyoku, followed in 1998 with the Underground Garden, the Cursed Prison and Maria Renard as a playable character. The PSP’s Dracula X Chronicles in 2007 brought a new English dub and a revised script.

SOTN Ultimate puts all three on one PlayStation disc. The mod’s README lists the Underground Garden (“a hedge garden with a fountain, greenhouses, a gazebo”) and the Cursed Prison, the inverted-castle twins of both, the Saturn-only Skeleton Leader boss, 18 Saturn enemies, God Speed Shoes that let Alucard sprint through doors, and a third equipment slot for food and potions. Exploring everything now reaches 211.8% on the castle map, against 200.6% on the PlayStation.

The download holds no Konami data. The README says the patch “holds only the mod’s own changes,” and an offline page called builder.html reads your own dumps of the US PlayStation disc, the Japanese Saturn disc and the US PSP game, then converts the Saturn and PSP content on your PC. The result has to match one exact checksum, or the page won’t offer it.

Fitting it on one disc took some packing. The music and voices are streamed from the data track instead of CD audio, filler is gone, and voice lines that were identical on both channels are stored in mono. The image uses about 290,400 sectors, “well under a 74-minute disc’s 333,000,” per the README. It’s been tested in the DuckStation emulator and on a burned CD-R in an original PlayStation, which needs a modchip to boot it.

The Saturn enemies were “translated from SH-2 to C,” the README says, rewriting code for the Saturn’s processor so it runs on the PlayStation. That work rests on sotn-decomp, a fan project that rebuilds the game’s source code so it “compiles byte-for-byte to the same binaries,” covering the PlayStation, PSP and Saturn versions.

The author is upfront about how it got made. “Most of the work here was done with AI assistance and painstaking, gruesome testing,” BelaLugosiIsDead writes in the README’s closing notes. “Believe me, the hack started with Alucard falling into nothingness.” The same notes say the project will go to a GitHub repo “eventually,” for the community to keep. No date is given.

Why it matters

Decompiling the game made ports like this possible. Once a game exists as C source that rebuilds the original, moving rooms and enemies between versions becomes programming work instead of byte-level patching. The README credits sotn-decomp directly: “none of this would exist without your work turning Symphony of the Night back into C.”

The patch carries no game data, only changes. The builder needs three legal dumps and checks each against known checksums. Playing it takes all three games, and the README’s last word to players is “Buy them, dump them, keep them.”

It runs on the real console. The README says the main game code keeps “its retail memory layout,” with unused debug code removed to make room, so the mod lives inside a 1997 console’s memory limits and plays from a disc.

The fine print matters. Old GameShark codes can break it, the Saturn’s videos weren’t ported, and a save loaded back on the original game shows the new rooms as white blocks on the map. Each of those is in the README’s known-issues list.

Steal this

Check the version before you replay a classic. Symphony of the Night had real content differences between PlayStation, Saturn and PSP releases. It’s like buying a director’s cut and finding scenes the theatrical release never had. Before a replay, look up what each release added, and pick the one with the content you missed.
Dump your own discs and keep the checksums. The builder only works with dumps that match Redump’s checksums. Kind of like a recipe that only works with the exact brand of flour. When you rip a disc you own, verify it against Redump’s entry and keep the file with its checksum.
Leave cheats off on heavy mods. The README warns that cheat codes for the original game “can break it,” because the mod moves code and data around. This is like using an old map after a city renumbers its streets. On any big romhack, turn off cheat codes and back up your memory card before you start.

A mod that can move Saturn code onto a PlayStation, by way of a decompiled game and an AI assistant, points at what else could move next. The sotn-decomp project already covers the PSP and Saturn builds, so the same path could work in the other direction or on other games with matching decompilations. The open question is what happens when Bela’s GitHub repo goes up and the community gets the whole toolchain instead of one finished disc.

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A Fan Mod Puts the Sega Saturn's Extra Castle Areas and a Playable Maria Into the PlayStation's Castlevania: Symphony of the Night, All on One CD-R

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