The current build is Engines 1.3.0 for Factorio 2.1. It requires Factorio 2.1.20 or newer and Yuoki Industries 1.3.0 or newer. Engines 1.3.0 does not target Factorio 2.0.
Install and enable both Yuoki and yi_engines. For a source checkout, put the source files in a yi_engines_1.3.0 directory inside Factorio's mods directory, with info.json directly inside it. Use a compatible Yuoki Industries release alongside it.
Space Age is optional; when enabled, it must also be 2.1.20 or newer. With Space Age, the green transport tubes require tungsten plates and a foundry. Back up existing saves before upgrading the game and mods together.
See the official download page for the current game releases. As of October 8, 2026, 2.1.21 is experimental; 2.0.77 remains stable.
Checked against the Factorio 2.1.21 API and the official 2.1.21 headless engine, using Yuoki 1.3.0. Fresh map creation, save loading, a 600-tick simulation, and prototype data generation pass in these configurations:
| Configuration (all include Yuoki and Engines) | Result |
|---|---|
| Base game | Pass |
| Base + Recycler + Quality | Pass |
| Space Age + Elevated Rails + Recycler + Quality | Pass |
| Space Age + Elevated Rails + Recycler, Quality disabled | Pass |
The port updates recipe and fuel categories, factory module inventories and assembler pictures, generator pictures, and shaft connection overlays. It preserves the existing 1000-degree steam production used by Rheinsberg and the turbine recipes.
Headless checks do not verify rendered graphics, migration of an existing 2.0 save, complete production-chain balance, or third-party mod combinations. Legacy unused-prototype-field warnings remain; successful loading does not establish that every older field still has an effect.
Contributor checks and CI: CONTRIBUTING.md and development guide. Pullfrog usage and maintenance: owner commands.