[Release] MU Online 0.97k Solo: GameServer + Client compiled to WebAssembly, runs 100% in the browser

[andvolodko2]

MU Online 0.97k Solo Classic (WebAssembly)

A standalone single-player MU Online 0.97k that runs entirely client-side in the browser. No ConnectServer, JoinServer, DataServer or database, and no install.

Play:

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Source:

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How it works

• Server: the original 0.97k GameServer logic built with Emscripten (C++17, ~700 KB wasm), hosted in a dedicated Web Worker with a 20 TPS tick loop.
• Transport: TCP is replaced by an in-memory packet channel (C1/C2 protocol), so there is no network latency.
• Storage: the SQL database is replaced by a virtual filesystem (/saves) with AES-256-GCM encryption and SHA-256 integrity checks. Progress is auto-saved to the browser's LocalStorage, and you can export/import saves as a file.
• Client: the Win32 client sources ported to WebGL2, with miniaudio, touch controls, a virtual joystick and gamepad support.
• Platform layer: a Win32 API emulation header for POSIX/Emscripten.

Content

• 17 maps with collision terrains (Lorencia, Devias, Noria, Lost Tower, Atlans, Tarkan, Blood Castle, Devil Square...)
• 3,245 monster/NPC spawns from the original tables
• Original combat formulas, skills, quests, drop rates and Chaos Machine combinations
• GM and player commands (/make, /makeset, /reset, /ware...), see docs/COMMANDS.md in the repo

Difficulty realms (isolated saves and warehouses, trade disabled)

         Easy    Medium   Hard
EXP      300x    100x     30x
Drops    150%    100%     50%
Reset    Lv 300  Lv 400   Lv 400
Monsters 0.7x    1.0x     1.5x

Status
It's an early build. The roadmap stages (server port, in-memory transport, VFS storage, encrypted saves, difficulty realms, WebGL2 client, client-server bridge) are done, but expect bugs. Bug reports and ideas are welcome here or in the GitHub issues.

Credits

• EmanuelCatania: Mu-Linux-0.97k and Mu-97k-Client-Source
• Kayito (Nico Muratona) and the MuEmu community: MuEmu-0.97k-kayito
• Cursor and Google Antigravity were used as AI pair-programming tools during the port

All MU Online lore, audio and 3D/visual assets are the property of Webzen. This is a non-commercial project for educational and archival purposes.

Feedback, bug reports and suggestions are welcome!