Xenosaga Episode I: Der Wille zur Macht · PlayStation 2
Xenosaga Episode I Decompilation
xsg-i-decomp is a matching decompilation of Xenosaga Episode I: Der Wille zur Macht for the PlayStation 2, NTSC-U. Its README reports 5,852 of 7,645 in-scope game functions recovered, 76.5%, with the main executable at 90.4%. It is In Progress, developed with AI assistance per its README, and rebuilds PS2 files, not a PC port.
How to build it
- Use your own NTSC-U Xenosaga Episode I disc; the main executable is SLUS_204.69.
- Gather the three things the README says the repository does not contain, starting with your own copy of the game.
- Tell the build where those three are, as the README's numbered steps describe, then build with ninja.
Game version you need
- USA · SLUS-20469
Hardware & system
No minimum stated in the README. Runs on: PS2 build (PCSX2 / hardware).
Versions, platforms & known issues
| Project | Type | Release | Status | Runs on | Game version | Last update |
|---|---|---|---|---|---|---|
| xsg-i-decompMatching decompilation, developed with AI assistance per its README. 76.5% of in-scope game functions recovered. | Decompilation | No tagged release | In Progress | PS2 build (PCSX2 / hardware) | USA · SLUS-20469 | Oct 16, 2026 |
Related links
About the game
Xenosaga: Episode I - Der Wille zur Macht, the first chapter of a trilogy, is a Japanese-style sci-fi role-playing game, sharing many common themes and gameplay elements with Xenogears. The battle system is not unlike the one used in Xenogears (combo attacks, AP and EP gauges, etc.), but random encounters are eliminated. Instead, the enemies are now visible and battles can be avoided. During combat the few upcoming ally and enemy turns are shown onscreen, allowing the player to make strategic decisions based on who will act next. A rolling slot moves with each turn as well, conferring a bonus such as added damage or bonus XP for any action on that turn. If the enemy would be in position to take an advantage then the player can expend a character's "boost" gauge to cut in and act next, although enemies can boost as well, and enemy boosts always over-ride player boosts. Each character has a unique tree of Ether spells they can learn by spending Ether points earned in battle, with lower spells requiring spells above them to be purchased first. After a spell is purchased, so long is it does not require a unique talent of that character, the spell can also be purchased and learned by any other character that can afford double its normal cost. The Anti-Gnosis Weapon Systems can be equipped with different weapons and accessories and can be used in combat provided that a character has enough AP on that turn to board their AGWS.
- Original platform
- PlayStation 2
- First released
- Feb 28, 2002
- Release · Japan
- Feb 28, 2002
- Release · North America
- Feb 25, 2003
- Developer
- Monolith Soft
- Series
- Xeno
- Genre
- Role-playing (RPG), Turn-based strategy (TBS), Adventure
- Themes
- Fantasy, Science fiction
- Modes
- Single player
- Perspective
- Third person, Bird view / Isometric
- Rating
- ESRB T
Story (via IGDB, in English)
Shion is running final tests on KOS-MOS aboard the Woglinde when the crew retrieve a Zohar Emulator, one of thirteen replicas of the Zohar. Cherenkov monitors Shion's progress, but is also a U-TIC spy furthering their goal of finding the original Zohar. Following the Zohar Emulator's retrieval, the Woglinde is attacked by Gnosis. KOS-MOS self-activates and protects Shion's team, in the process killing Virgil with friendly fire to save Shion and Allen. KOS-MOS brings them and Cherenkov on board the Elsa, which is heading to their destination of Second Miltia. When a Gnosis attacks, chaos' ability to dispel them saves Cherenkov's life. The attack begins mutating Cherenkov, tormenting him with visions of his past as a soldier who failed to adjust to civilian life and killed many people including his wife. During these periods, Shion becomes concerned about KOS-MOS's behavior, and Allen worries about Shion's emotional state. Alongside these events, the cyborg Ziggy is dispatched to rescue the Realian MOMO from U-TIC, as data stored inside her could open the way to the original planet Miltia, lost in a disaster for which her creator Joachim Mizrahi is blamed. Ziggy rescues MOMO and narrowly escapes, fending off attacks by Margulis. Albedo, who is working with U-TIC for his own goals, sets out in pursuit of MOMO.
Artwork
Screenshots
Trailer
More videos: PS2 Longplay [014] Xenosaga: Episode 1 - Der Wille zur Macht (US) (Part 1/3)
Game details, cover art and screenshots from IGDB via LizardByte GameDB, retrieved Oct 18, 2026. Images are © their respective owners.
About this project
Progress is reported per file: the overlays the game loads as needed range from about 43% to 85%, and two IOP modules have not been started. The Sony SDK and public libraries are out of scope. A gate step checks each unit and the SHA-256 of whole files. As of Oct 18, 2026, no Xenosaga PC port meets Recompedia's inclusion rules.
FAQ
How far along is the Xenosaga Episode I decompilation?
Per the README, 76.5% of in-scope game functions are recovered, including 90.4% of the main executable SLUS_204.69.
Was the Xenosaga decompilation made with AI?
The README states that the project is developed with AI assistance.
Does Recompedia provide the game, ROM or BIOS?
No. Recompedia does not host or link to ROMs, ISOs, BIOS files or game assets. xsg-i-decomp ships no game code or data either; it needs a disc image made from a copy of the game you own.
Recompedia does not host or link to ROMs, BIOS files or game assets. Every project listed requires a copy of the original game owned by the player. Status checked against the project's own repository on Oct 18, 2026.