BoplEight

A BepInEx 5 plugin implementing an experimental synchronized 2-8 player mode for Bopl Battle.

BoplEight is build-locked and still requires real multi-client validation. It refuses to patch unsupported Bopl Battle versions.

Current State

• The plugin targets BepInEx 5.4.23.2 and BoplEight 1.0.7 protocol version 3.
• Runtime patches are applied only to the inspected Assembly-CSharp.dll SHA-256 06A154AF64AD962E534587058219FB94216C5CE53605BB9AF5F77CB433A4AE07.
• Steam lobbies support two through eight players and reject vanilla, mismatched-plugin, mismatched-protocol, and mismatched-game clients.
• Every peer verifies the same deterministic ability manifest before the host can start.
• Match start and next-level rosters use prepare, acknowledgement, commit, and commit-acknowledgement phases bound to a hash of the exact roster.
• Character selection, player/team colors, spawning, winner UI, ability UI, physics hit buffers, frame aggregation, and simulation input support up to eight roster slots.
• Gameplay retains the game's per-player Steam input transport. BoplEight only replaces fixed four-player aggregation and application.
• Replay recording is disabled for BoplEight matches because the game's replay format contains four input slots.
• A roster disconnect, authority change, incomplete frame, failed commit, or desync ends the match instead of continuing with divergent state.

Compatibility

Every player must install the same BoplEight build and use the supported game assembly. Mixed deterministic asset manifests, including incompatible full/demo ability sets, are rejected before match start.

BoplEight lobbies are intentionally isolated from unmodded matchmaking. There is no runtime configuration switch for partially enabling the mod.

Build

Run ./build.ps1 from this directory. The script runs 49 protocol/model/layout tests, compiles dist/BoplEight.dll, and installs it as BepInEx/plugins/BoplEight.dll unless -NoInstall is supplied.

The repository can be cloned anywhere. Pass -GameRoot, set BOPL_GAME_ROOT, or let the scripts discover Bopl Battle through Steam. See Building From Source.

Friend Installer

Build the self-contained Windows installer with ./installer/build-installer.ps1. The release executable is written to installer/dist/BoplEight-Setup-1.0.7.exe and includes BepInEx 5.4.23.2 plus BoplEight.

Friends only need to run the EXE, approve the administrator prompt, click Install BoplEight, and then launch Bopl Battle normally through Steam. No mod manager or manual file placement is required. Because the installer is not code-signed, Windows SmartScreen may require More info followed by Run anyway.

See Installing BoplEight for troubleshooting and uninstall behavior.

Repository

• src/: protocol, lobby, roster, UI, and runtime implementation.
• tests/: standalone deterministic protocol and model tests.
• installer/: Windows installer source, tests, payload notices, and build procedure.
• docs/ARCHITECTURE.md: protocol and runtime design.
• docs/RELEASING.md: release checklist and artifact policy.
• CONTRIBUTING.md: development requirements and safety rules.

Validation Status

• Automated protocol and model tests pass.
• A clean game startup verifies every critical Harmony patch and loads without BepInEx errors.
• Real 2-8 client Steam matches, disconnect recovery, paused next-level transitions, and every level's synthesized extra spawn anchors still require live multiplayer testing.