Opus Magnum

Opus Magnum (PC, 2017) has an open-source reimplementation, ianh/omsim, and 1 other public project, including code that decompiles almost back to source.

Data checked 2026-10-12 · unbaked registry

Projects

omsim (Opus Magnum simulator/verifier with bot API)

ReimplementationC (libverify.so API for bots)26 starspushed 2026-10-06custom licenserelease libverify-windows-x86_64

simulator for 2017 zachtronics puzzle game "opus magnum"

GitHub

Opus Magnum (C# Zachtronics engine; Quintessential mod loader)

Readable bytecodeC# .NET (Zachtronics in-house engine), MonoMod-based Quintessential l…

What you need

You need your own copy of the game: these projects ship code only.

More on PC

GameMethodYearStarsLast push

PCMindustrySource releaseAgent environment201929k2026-10-11 PCosu!Source releaseReadable bytecode+1200719k2026-10-12 PCCommand & Conquer Remastered CollectionSource release202021k2025-01-16 PCRollerCoaster Tycoon 2ReimplementationAgent environment200216k2026-10-12 PCDune 2000Reimplementation199818k2026-10-11 PCAge of Empires IIReimplementation199914k2026-10-03 PCCataclysm: Dark Days AheadSource release201313k2026-10-12 PCCivilization VSource releaseReimplementation201011k2026-10-12

Found via store.steampowered.com/app/558990/

GitHub data checked 2026-10-12. Notes are summaries from the research pass; the project pages are the authority.