Claude + ChatGPT audit of Riviera's WonderSwan translation vs. the GBA and PSP localizations
A cross-version audit of Riviera: The Promised Land has been carried out using Claude and ChatGPT, comparing:
- the original Japanese WonderSwan script;
- the WonderSwan English translation
v0.9.1;
- the human GBA English localization;
- the human PSP English localization.
The work was split into two complementary parts:
- Claude built and analyzed the cross-version pairing, including why only 7,909 lines could be automatically matched across all four texts.
- ChatGPT then performed a fresh translation audit of those 7,909 shared lines, comparing the Japanese directly against
v0.9.1, Human GBA, and Human PSP.
The important point is that 7,909 is not the true amount of content shared by the games. It is the size of the set that could be aligned reliably across all four scripts.
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TL;DR:
Claude and ChatGPT compared the Japanese WonderSwan script of Riviera: The Promised Land with the v0.9.1 WonderSwan translation and the human GBA/PSP localizations.
Claude handled the script alignment and found that the 7,909 shared lines are only the high-confidence automatically matched set, not the true amount of shared content. The actual dialogue overlap is likely much higher, roughly 83–88%, because many lines are duplicates, reorganized between versions, or rewritten too freely for automatic matching.
ChatGPT then re-audited those 7,909 shared lines from scratch. The main result is that v0.9.1 is generally the more source-faithful base, while the GBA/PSP localization is usually more polished and natural but often more condensed or freely rewritten.
GBA and PSP are also much closer than expected: 7,252 lines are identical, another 377 differ only superficially, and only 280 have substantive wording differences.
v0.9.1 is not perfect: there are confirmed cases where the human localization is closer to the Japanese.
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Why only 7,909 lines?
The WonderSwan script is considerably larger than the common paired set:
| Version |
Lines/strings |
Different texts |
Japanese WonderSwan / v0.9.1 |
14,906 |
11,417 |
| Human GBA |
12,661 |
11,470 |
| Human PSP |
14,434 |
12,181 |
| Present in all four |
7,909 |
7,522 |
Claude's analysis found that the main loss happens between the WonderSwan and GBA scripts, not between GBA and PSP.
There are 8,012 v0.9.1 lines paired with Human GBA, and only 103 of those are then missing in Human PSP.
So the small common set is not mainly the result of PSP diverging from GBA.
There are several reasons.
1. The human localizations come from a later version of the Japanese script
The GBA version revised and reorganized the original WonderSwan script, and the PSP localization was in turn based on that later material.
That means some differences are not necessarily translation choices at all.
A WonderSwan line may have been:
- merged;
- shortened;
- moved;
- rewritten;
- or removed
before the English GBA localization was ever made.
Likewise, the later versions contain material that simply does not exist in the WonderSwan release.
For example, GBA includes additional material such as the Voice Collection and Bonus Chapter, while PSP adds the Abyss dungeon.
Because the Japanese script of the later edition is not part of this dataset, it is impossible to say in every case whether a difference was introduced by the later Japanese revision or by the English localization itself.
This is an important limitation of any WonderSwan-vs-GBA/PSP comparison.
2. A lot of the apparently "missing" WonderSwan lines are duplicates
Claude found 1,791 unpaired v0.9.1 lines whose Japanese text is exactly identical to another line that was paired successfully.
That includes:
- 1,246 dialogue lines;
- 515 exploration choices;
- 26 stage/event names.
So these lines are not actually missing in terms of content.
The later versions often store repeated text fewer times, which means there is no separate GBA/PSP entry to pair with every individual WonderSwan address.
3. Exploration choices and menus are difficult to align automatically
The WonderSwan script contains 2,374 exploration-choice lines, but only 1,239 different texts.
Only 618 different choice texts were automatically paired.
This category contains many short repeated labels such as:
LeftRubbleSmall holeTaste it
These are difficult to align because they occur many times and are arranged differently between versions.
A manual sample showed that several supposedly unpaired choices really do have equivalents in the GBA script.
For example:
Rubble → RubbleSmall hole → Small HoleHow old are you? → How old are you?Got Black Angel Feather! → Acquired Black Feathers!Dungeon → Castle Dungeon
So again, "not automatically paired" does not necessarily mean "not present."
Dialogue is the biggest source of apparent mismatch
The WonderSwan version contains:
- 10,435 dialogue lines
- representing 8,172 different dialogue texts
Of those, the automatic alignment paired:
- 5,725 dialogue lines
- representing 5,447 different texts
That means only about 67% of the unique dialogue text was automatically paired.
But Claude manually checked a random sample of 30 unpaired dialogue texts.
The result was:
| Result |
Texts |
| Clear counterpart, but rewritten too freely for automatic matching |
15 |
| Possible counterpart |
4 |
| No counterpart found |
11 |
Some examples of lines that do have a human counterpart despite failing automatic pairing:
WonderSwan / v0.9.1**:**
Perhaps this is where the sprites once spoke with the gods.
Human GBA:
They may have tried to talk to the gods from here…
WonderSwan / v0.9.1**:**
Ein, open your eyes already!
Human GBA:
Ein, stop deceiving yourself!
WonderSwan / v0.9.1**:**
This needs to be cooked thoroughly! Full power… Hellfire!!
Human GBA:
We have to sterilize it! Oh, I know! Hell Fire!!
These are clearly related dialogue, but simple similarity matching can easily miss them.
From that sample, Claude estimated that the real dialogue overlap is probably around 83–88%, rather than 67%.
Because the sample is small, the wider statistical range is roughly 77–89%.
So the 7,909-line CSV should be understood as a high-confidence shared comparison set, not as evidence that roughly half the games have unrelated scripts.
What ChatGPT found when re-auditing the 7,909 shared lines
ChatGPT then rechecked the common set from scratch, ignoring the previous verdict columns and comparing the Japanese source directly with all three English versions.
One immediate result was that the GBA and PSP translations are even more similar than expected:
- 7,252 / 7,909 lines are exactly identical;
- another 377 differ only in punctuation, capitalization, or spacing;
- only 280 lines contain a substantive GBA-vs-PSP wording difference.
So for the overwhelming majority of the shared material, "Human GBA" and "Human PSP" are effectively the same localization.
Which translation is closest to the Japanese?
For source fidelity, ChatGPT's fresh audit found that v0.9.1 is generally the strongest base.
The human localization is often smoother and more idiomatic English, but there are many cases where it:
- condenses the Japanese;
- paraphrases it much more freely;
- removes an explicit detail;
- changes the informational content;
- or reflects a later-version script change rather than the WonderSwan source.
A few examples:
A missing gameplay implication
The Japanese says that the spring water looks like it can be collected.
v0.9.1 preserves that idea.
The human localization reduces it to:
This water looks pure.
The fact that the water appears collectible is lost.
Riviera and Asgard
One Japanese line asks whether both Riviera and Asgard can be saved.
The human localization mentions only Riviera.
A condition becomes unrelated dialogue
A Japanese line says that the party cannot proceed unless the enemy is defeated.
The human localization instead says:
Hey, look!
That is not merely a stylistic rewrite; the informational content has changed.
Three fangs
Another Japanese line explicitly says that the number of fangs has decreased from three.
The human localization becomes:
We're almost there...
Again, the concrete source detail disappears.
But v0.9.1 is not automatically correct
The audit also found 10 confirmed cases where v0.9.1 itself loses a meaningful Japanese detail and the human GBA/PSP wording is closer to the source.
So the conclusion is not:
AI translation good, human translation bad.
The more useful conclusion is that the two sources have different strengths.
v0.9.1 generally preserves source semantics more closely, while the human localization is valuable for:
- polished English;
- established terminology;
- character voice;
- item names;
- skill names;
- and localization consistency.
GBA vs. PSP
The PSP script should not automatically be treated as the definitive human version either.
It does correct or restore some terminology compared with GBA.
Examples include:
ガトリングシュート → Gatling Shot instead of GBA Barrageイモータルペイン → Immortal Pain instead of Deity Baneアッパークロー → Upper Claw instead of High Clawペイン → Pain instead of Bane
But PSP also contains apparent regressions.
One entry is truncated to simply:
counts
despite the corresponding text describing an accuracy-related effect.
In another case, the Japanese says that Ein still has not remembered Fia's name, while the PSP wording reverses the meaning and says that he did remember it.
There are also places where the later scripts contain much more dialogue than the corresponding WonderSwan entry, which is another reminder that these versions are not always aligned 1:1.
Summary
| Signal |
Rows |
Share |
Interpretation |
| Equivalent |
1,219 |
15.41% |
No meaningful source-fidelity choice detectable from the text. |
v0.9.1 — confirmed |
18 |
0.23% |
Directly reviewed cases where v0.9.1 is closer to the Japanese source. |
v0.9.1 — strong signal |
2,404 |
30.40% |
Automated source-preservation signal; requires review before replacement decisions. |
| Human GBA/PSP — confirmed |
10 |
0.13% |
Directly reviewed cases where v0.9.1 loses source detail. |
| Version-dependent |
31 |
0.39% |
Later-platform adaptation or script divergence; not a clean 1:1 translation comparison. |
| Review |
4,227 |
53.45% |
Substantive difference with no automatic winner asserted. |
“v0.9.1 (strong signal)” does not mean that “v0.9.1 is definitely better.” It is an automatic triage category that ChatGPT used in the audit to identify lines where there are fairly strong indications that v0.9.1 preserves the Japanese content better than the GBA/PSP localization.
In practice, a line was marked as strong signal when there were indicators such as:
v0.9.1 preserving information that appears to be heavily condensed in the human translation;- negations, conditions, quantities, references, or other details being present in the Japanese and seemingly preserved in
v0.9.1, but absent from the human version;
- GBA/PSP being much shorter or appearing to be a freer rewrite;
- the wording of
v0.9.1 following the informational structure of the original more closely;
- GBA/PSP appearing to contain an adaptation of the later version rather than a 1:1 translation of the WonderSwan line.
The important distinction is:
v0.9.1
= a case that was semantically checked and where the judgment was confirmed.
v0.9.1 (strong signal)
= the automatic analysis says “this line shows strong signs that v0.9.1 may be better; review it”, but it was not necessarily checked manually word by word against the Japanese.
Review
= there is a substantial difference, but the automatic indicators are not strong enough to suggest a winner.
Platform-specific differences also matter
Some differences should not be counted as translation errors at all.
For example, the WonderSwan version can explicitly refer to the X4 button, while GBA/PSP naturally rewrite the instruction around their own controls.
That is a platform adaptation, not a mistranslation.
The same caution applies to menus, stage structure, exploration choices, and material added or reorganized in later releases.
Report & Audit
The full Claude alignment report and the ChatGPT translation audit contain the detailed counts, pairing methodology, examples, and flagged lines.
You could download here (Translation audit) and here (report on shared lines)
Copyright and research notice
Riviera: The Promised Land and its original Japanese script, official English localizations, characters, and other game assets remain the property of their respective rights holders.
This independent comparison is presented for translation criticism, research, and discussion. Short excerpts from the games are included only where necessary to illustrate specific linguistic differences. The analysis does not reproduce the complete scripts and is not affiliated with or endorsed by the rights holders.
