PeakCrossVersion

Author: kirigiri
Version: 1.0.0
Thunderstore Package ID: kirigiri-peak-crossversion

📌 Description

PeakCrossVersion is a BepInEx plugin that enables players on different game versions of Peak to connect and play together.

It bypasses version restrictions in matchmaking and Steam lobbies, allowing for cross-version multiplayer — ideal for playing with friends who haven’t updated (or have intentionally stayed on an older version).

⚠️ Important: All players in the session (host and clients) must have this mod installed for compatibility to work.

⚙️ Features

• ✅ Force custom Photon matchmaking version
• ✅ Add version info to Steam lobby metadata
• ✅ Allow joining lobbies even with version mismatches
• ✅ Compatible with lobby invites and multiplayer flow

📦 Installation

1. Install BepInEx to your Peak game folder.
2. Download this mod.
3. Place the PeakCrossVersion.dll file into:
   BepInEx/plugins/PeakCrossVersion/
4. Launch the game.

Optional: Use this mod to bypass the update message on older version https://thunderstore.io/c/peak/p/kirigiri/PeakVersionBypass/

🔧 How It Works

This mod modifies the following:

• Photon: Forces custom GameVersion (kirigiri.1.0.a) for matchmaking
• Steam Lobby:
  • Tags created lobbies with the custom version
  • Bypasses version mismatch popups when joining
• Host Launching: Ensures proper scene loading even across versions

⚠️ Compatibility Rules

• ✅ You can play with others on older or newer versions
• ✅ Everyone in the session must have the mod installed
• ❌ You cannot connect to vanilla clients or servers without the mod
• ❌ This mod does not downgrade or patch game assets — version desyncs may still cause instability if game content changed

💬 Notes

• If the game version changes assets (e.g. maps, scripts), cross-version gameplay may have bugs or crashes.
• Always ensure both players use the exact same mod build to reduce risk.

🧪 Known Limitations

• Version mismatch UI is suppressed, but content mismatches still apply
• Only intended for casual/private use — don’t abuse in public lobbies

✅ License

MIT License — free to modify, fork, or redistribute with credit.