RE:INTEGRAL — first alpha

Download the windows-x86.zip asset, extract the entire folder, and open
RE-INTEGRAL.exe. Keep the launcher beside mgs-integral-native.exe.
The symbols and MPL source ZIPs are separate downloads for debugging and
source access; they are not needed to play.

Requirements

• Windows 10 22H2 or Windows 11, with .NET Framework 4.8 enabled for the launcher.
  The game is a 32-bit executable and also runs on 64-bit Windows.
• A Direct3D 12 capable GPU and driver supporting the bundled SDL GPU backend.
  A broader hardware compatibility matrix is still to be established.
• Your Japanese Integral Disc 1 (SLPM-86247) and Disc 2 (SLPM-86248) in
  single-track MODE2/2352 BIN/CUE format. Select the CUE files and keep their
  BIN files alongside them. Other editions, plain ISO images, and VR Missions
  are not supported by this alpha. No game content is supplied.

Players do not need Git, Python, CMake, Visual Studio, or PowerShell scripts.
The launcher uses Windows' .NET Framework; the native C/C++ runtime and SDL are
linked into the game. The executables are unsigned.

First launch

1. Select both disc CUE files in Discs and display.
2. Choose a resolution and enable widescreen/fullscreen as desired.
3. Review Gameplay for optional bonus items, invulnerability, auto-card,
   and Psycho Mantis memory profiles. Defaults leave gameplay aids disabled.
4. Click Save and play. Disc identities are checked before the game starts.

Developer options exposes debug overlay, startup stage and frame limit.
The additional-arguments field accepts the remaining native command-line
options, including mod paths and recording/replay arguments. These arguments
are passed directly to the engine after the other settings; they can override
those settings. Argument help lists accepted flags and Show command
displays the command. Random Mantis profiles choose a seed for each command.
Development stage entry does not establish the campaign state required by a
scene. The source checkout's tools/run.ps1 remains the richer recording and
replay-session workflow; the launcher does not generate its session sidecars.

Saves, settings and logs

The launcher stores data in %LOCALAPPDATA%\RE-INTEGRAL:

• settings.xml: disc paths and launch options.
• bu00 and bu10: native memory-card saves, created by the game.
• logs: a separate timestamped log for each game process, with version and
  commit information. Logs can contain local file paths and launch arguments.

Updating or replacing the application folder preserves this data. Existing
development saves under .local/runtime/bu00 and bu10 can be copied to the
corresponding folders while the game is closed. Back up both locations first.
The launcher prevents simultaneous instances sharing its save directory.

If the game requests a restart, the launcher starts it again with the same
arguments. If startup fails, use Open logs and include the relevant error
when reporting a bug. Reopen the launcher to repair paths after moving discs.

Controls

• Arrows: D-pad; X/D/Z/S: Cross/Circle/Square/Triangle.
• Q/R: L1/R1; W/E: L2/R2; Enter: Start; Backspace: Select.
• Circle confirms and Cross cancels in Integral menus. Keys use physical SDL
  positions; Square is labelled Y on German QWERTZ keyboards.
• SDL gamepads are supported. Xbox A/B/X/Y map to Cross/Circle/Square/Triangle.
• F2 or L3 + R3 swaps controller ports for Psycho Mantis; repeat to return.
• F4 toggles fullscreen; Escape quits.

Alpha status and feedback

One main-campaign route was completed through credits on 10 October 2026.
That does not establish coverage of all branches, optional modes, controllers
or GPUs. This alpha focuses on installing and launching the native build.
Regional resource selection, VR Missions, the replacement Godot renderer and
broader mod formats remain future work; see the repository roadmap.

Report bugs at https://github.com/Drommedhar/mgs-reintegral/issues with the
version, reproduction steps, Windows/GPU/controller details, and relevant log.
Do not attach retail disc images or extracted game content.

Original project contributions have the scoped MIT license in LICENSE.
Third-party terms, known uncertainties and corrections are documented in
THIRD_PARTY.md; accompanying license texts are in licenses and source-access
information is in SOURCE-AND-NOTICES.txt.

Unofficial project; not affiliated with or endorsed by Konami.