Horizon of Steel

An idle ARPG on PC

Horizon of Steel is an idle ARPG set on a planet that’s a machine. Its threat-assessment system is still running tests, and your Frame is one of the units it sends into them. You don’t control fights directly. Instead, you build a Frame, set how it behaves, and queue it into Journeys that run on their own.

Each run is a deterministic simulation. You can watch it in an ASCII battle view or replay it exactly. If you close the game, offline catch-up runs for the time you were away, starting with a four-hour limit and reaching up to 24 hours later. Each character can run its own queue at the same time.