Onlyfun is an Android-only Mophun emulator built with Unity. This fork focuses on getting legacy Mophun games running on modern Android phones with as little setup as possible.
Download the newest Android APK from the Releases page.
The current development build targets Android 8.0+ (API 26) and ARM64 devices. It is a test build: install it manually and allow Android to install apps from your browser or file manager when prompted.
- Open Onlyfun and tap +.
- Select the original
.mpnfile. - Onlyfun validates it, detects encrypted Mophun code, and decrypts supported files locally when needed.
The original file is never modified. Decrypted working copies are stored in the app's private storage and cached by the source file's SHA-256, so the same game is not decrypted again on every import.
No key files, desktop tools, manual conversion, or extra user steps are required.
If a game uses an unsupported Mophun format, Onlyfun shows a readable error and records the technical details in onlyfun.log.
The Android build includes the encryption profile required by the encrypted Honey Cave 2 MPNs commonly found in preservation archives. After import, the game should launch in the same way as an already decrypted copy.
Open a game's settings before launch, or use the gear button while it is running. Some Sony Ericsson games require a matching phone model and system version 1.30; Honey Cave 2 uses its legacy compatibility profile automatically.
Please include:
- Android model and OS version;
- the Onlyfun APK version;
- the exact error shown in the app;
onlyfun.logfrom the export dialog.
Do not upload commercial game files or ROMs to the repository.
This project is intended to be opened with Unity 6000.5.6f1 (Unity 6.5) and the Android Build Support module. The Android player is built with IL2CPP and API 26 minimum SDK.
The encrypted-game importer is organized around profiles, so additional Mophun encryption families can be added without changing the Android import flow.
Onlyfun is based on the original Nofun project by Radrat Softworks. Thanks to JaGoTu for the decompression work, 1upus for help with Mophun encryption, and the Kahvibreak preservation community for recovered resources.
Copyright 2023 Radrat Softworks.
The source code is licensed under the Apache License 2.0.