Inside SIGS & WON.
Versioned protocol references for the Sierra Internet Gaming System and World Opponent Network. Choose the reference that matches your client.
How gameplay connects →
An architecture diagram and step-by-step explanation of the original game, replacement DLL, UDP relay, and modern routers.
SIGS 3.0.3.0 message reference →
71 cataloged messages, field layouts, evidence notes, and connection flow.
WON 4.0.5.0 protocol reference →
130 registered layouts, version differences, MachineID and game-data login, reports, moderator requests, and downloadable registration evidence.
These are incomplete, reverse-engineered references. A registered layout does not establish every field’s meaning or prove live game compatibility.