The Outer Line takes place on the frontier of human space. A cluster of Gravity Wells, each one a circular zone around a planet or celestial body, separated by vast stretches of empty void. Your job as an admiral is to take a Mobile Shipyard and a handful of ships into that cluster and secure it before someone else does.
Everything happens on one continuous map. No loading screens, no mode switches. Just space, and the points that matter in it.
What Gravity Wells are
The Jump Drive, the technology that makes interstellar travel possible, works by exploiting gravitational fields. The stronger the field, the easier it is to lock on and jump. This means travel only works between Gravity Wells, zones where planets, dense asteroid fields, or dwarf stars create enough gravitational pull. The empty space between them, Deep Space, has nothing to grab onto. You cross it, but you can't stay there, build there, or fight there in any meaningful way.
So the map becomes a collection of Gravity Wells connected by Jump Drive routes, with Deep Space as the distance between them. The Gravity Wells are where all the action happens: building Supply Nodes on asteroids, constructing defensive structures, positioning fleets, fighting. Deep Space is just the gap you have to cross to reach the next one.
Not all Gravity Wells are equal
This is where the strategy starts. A Capital world is large, dense with asteroids, full of potential Supply Nodes. Holding one gives you serious economic power, but everyone wants it, and defending a large area is harder than defending a small one.
A Mining Colony is focused on extraction. Good asteroid density, solid income potential. Frontier Worlds are the most common, balanced but unremarkable. Outposts are small and resource-poor, but an Outpost sitting between two rich Gravity Wells becomes a chokepoint that controls movement through the region.
Then there are Asteroid Fields. No planet at the center, no natural anchor for your defenses. Just rocks, resources, and exposure. Rich but risky. You can build Supply Nodes there and pull in a lot of income, but there's nothing to hide behind.
The map generator distributes these types so that the center of the cluster tends to be valuable and contested, while the edges are thinner. Your starting position is always reasonable, not a barren outpost at the map's edge.
One map, one war
The reason I built the game around a single continuous map is that I wanted the player to feel like an admiral running an actual operation, not someone switching between menus and views. You're managing Supply Nodes in one Gravity Well, watching a fleet charge up its Jump Drive in another, and wondering if that Outpost on your flank is going to hold. All of it is happening at the same time, on the same screen.
The lore supports this directly. In 2147, automated probes discovered these clusters of anomalous gravitational density, regions packed with Gravity Wells close enough to reach by Jump Drive. Every faction, the Federation, the League, the Compact, sent task forces to claim them. Each match is one of those operations. One admiral, one Mobile Shipyard, one cluster. The map is the cluster, the Gravity Wells are the prizes, and the Deep Space between them is the distance your enemies have to cross to take what's yours.
Geography that persists
When you fight in a Gravity Well, you're fighting around the specific asteroids and structures that exist there. If you destroyed the enemy's Supply Nodes last time you passed through, they're still gone. If you built a Military Station to hold the Gravity Well, it's still standing when the enemy comes back for another try. The map has memory.
This matters because it means positioning has weight. Fortifying a Gravity Well is an investment that pays off over time. Razing one is a strategic blow that takes real effort to recover from. When the Riftborn raid your Supply Nodes at an undefended Asteroid Field, the economic damage sticks until you rebuild.
Multi-front without losing your mind
The tactical pause ties into this. When you're managing several Gravity Wells at once, you can stop the game, scroll to a different part of the map, give orders, scroll back. No context loss, no loading, no forgetting what you were doing three Gravity Wells over.
I'm still working on the UI tools to make this comfortable on larger maps. A minimap, fleet summary panels, a strategic overlay that simplifies everything at max zoom. Right now it feels good with a handful of Gravity Wells. I'm less confident about maps with a dozen or more, where tracking everything could get overwhelming. That's the next problem to figure out.
The comparison I keep thinking about
Sins of a Solar Empire builds its maps around gravity wells too, and it handles massive fleets across huge systems brilliantly. What I wanted was something smaller. Fewer ships, more decisions per ship, tactical pause instead of real-time chaos. The Gravity Wells in The Outer Line are tighter. The fleets are smaller. You're not commanding hundreds of ships across a galaxy, you're commanding a few dozen across a frontier cluster where every Gravity Well you take or lose shifts the balance.
Whether that scale works for longer matches and bigger maps is something I'll find out with testing. For now, the cluster-sized maps feel right. The Gravity Wells are close enough that jumping between them is a real tactical decision with real consequences, and far enough apart that holding multiple fronts feels like a genuine challenge.
Next time
Next devlog will be about the Jump Drive itself, the system that ties all these Gravity Wells together. Charge-up windows, arrival vulnerabilities, and the decision of when to jump and when to stay.