Co-op Architecture & Project Roadmap

Co-op Architecture & Project Roadmap

Co-op Engineering and Project Roadmap

Classic late-90s and early-2000s strategy and RPG titles either shipped with fragile IPX/DirectPlay networking or cut multiplayer right before launch. Good Old Games Dev replaces legacy networking with a unified, deterministic co-op transport across all four ports.

Co-op Mode Comparison Across All 4 Ports

Game PortPlayersCo-op ArchitectureCampaign & Save SupportBuy Original Game
Jagged Alliance 21–6 PlayersShared Arulco campaign, shared finances, squad assignment & lockstep tactical turnsFull Arulco Revisited 1.4 campaign + .cocometa save recoveryGOG.com
Warlords III: Darklords Rising1–8 PlayersCouch hotseat & allied co-op (SetupScr.pcx seat manager, controller GUID hotplug & deterministic combat)Complete (v1.0.0) — Full campaigns, 43+ scenarios, Random Maps & portable savesGOG.com
Anno 1503 A.D. — Royal Edition1–4 PlayersRestored multi-island multiplayer + Shared Empire Co-op on a 20 Hz lockstep tickContinuous play & scenarios (in progress)GOG.com
Arcanum1–4 PlayersFull story campaign party co-op, shared world-map travel & synchronized turn-based combatMain Arcanum story module + Vormantown (in progress)GOG.com

Cross-Platform Determinism Rules

Because a single co-op session can mix macOS ARM64, Linux x86_64 (MSI Claw / Steam Deck), and Linux ARM64 (Khadas VIM1S), all simulation code adheres to strict cross-architecture determinism:

  1. No Unseeded rand() or Floating-Point Drift: All hit rolls, AI pathfinding tie-breakers, and economy ticks use explicit fixed-point integer math and synchronized PRNG streams.
  2. Command-Stream Lockstep + Turn Snapshots: Only player orders (move, fire, build, dialogue choice) travel over the wire, accompanied by per-tick CRC32 state hashes to detect any divergence immediately.
  3. Automatic Reconnect & Save Resync: Every turn boundary writes a paired .sav + .cocometa checkpoint so a dropped handheld or TV console can rejoin in seconds.