MMO World Simulator

Explore three settings: Sword Art Online, Overlord, and the original fantasy world of Irian. You can adapt Irian's flexible setting through Special Instructions.

An extensive custom interface brings character creation, equipment, NPCs, maps, music, and life outside the game together. Some features were inspired by projects on other platforms.

The original author recommends DeepSeek V4 Flash or stronger models and reports that Gemini 2.5 Flash Lite also worked reasonably well. Recalculate and Debug are available to correct state inconsistencies.

Fangsi permits edits and additions to the lore, and asks to be informed before a modified version is published.

Original world and interface by Fangsi (方思). Thanks to @啊啊啊 for contributions to the map system.