Feature

Watch the world play itself

Simulation Mode runs the same engine that powers a played game - only with every nation on AI. No cheats, no shortcut behavior. The AI plays by the same rules you would, draws on the same economy, the same research tree, the same diplomatic stack.

You set the scenario. You hit play. You watch the next 50 years happen.

The same engine, no shortcuts

The thing that makes most strategy game AI feel artificial is that it cheats. Free resources, perfect intelligence, scripted aggression. NationFall's simulation engine runs the AI on the player rules - and that is the entire point.

Every turn, the engine cycles through 17 phases. Each is the same code that runs in a played game. There is no second-tier sim engine running a simplified world. There is one engine.

Three modes, one core

Strategy mode is the standard played game - turn-based, your decisions, your nation. RTS mode runs the same engine on a clock: 20, 45, or 60 seconds per turn, AI handles the rest of the world live. Simulation mode strips the clock entirely and lets the engine run unthrottled.

What emerges

Because nothing is scripted, the same scenario runs differently every time - but always according to the rules. What you see is what those rules produce.

• Coalition formation. Smaller powers cluster against rising threats - and sometimes pick the wrong side.
• Sanctions cascades. One regime under pressure pulls its allies into the cordon. Targets get more isolated turn by turn.
• Resource-driven wars. Nations short on oil or rare earths reach for the producers. Geography stops being decoration.
• Nuclear races. Once one superpower goes nuclear, the rest of the room recalculates. The order they get there in matters.
• Empires unravel. War weariness, civil wars, and economic collapse fracture nations from the inside without a single invader.

Why this matters

Simulation Mode is partly a feature for players - set up a 1939 scenario, watch the alternate WW2 unfold, see what changes if you remove Pearl Harbor or hand the bomb to Germany.

It is also how the game gets balanced. Run 100 simulations of the same scenario. Different seeds, same starting state. Read the outcome distribution. The patterns that emerge - which nations win, which alliances hold, which strategies dominate - are how we tune the systems.

Because every run is deterministic from a seed, anything strange you see can be replayed turn-by-turn to find the cause. No ghost behavior, no irreproducible bugs. The sim is the test bed.