Trafficity Biomes Explained: Island, Locked Maps, and Modes

Why Trafficity Biomes Matter More Than You'd Think

Picking a starting map in Trafficity is not a cosmetic decision — the terrain under your first road decides where your city can actually grow. Trafficity biomes are the game's map archetypes, and the official store description says each one comes with a unique playstyle, so the seed you roll shapes your road hierarchy from the first minute. This guide covers what the sources actually confirm about Trafficity biomes, what is still locked behind progression, and how to read a map before you lay asphalt.

What the Official Description Confirms

Trafficity is a city builder built around roads and traffic, developed and published by Onramp Games. The official Trafficity Steam store page, captured on 2026-11-09, states the game includes "four biomes, each with a unique playstyle," three difficulty levels including a sandbox-style Chill Mode, and a procedural map generator.

That one line is the most concrete official statement about Trafficity biomes available before launch. The same snapshot does not name the four maps or describe their individual terrain, so treat any pre-launch list that ranks all four as unofficial until Onramp Games publishes it.

What the store page does detail is the toolkit you'll use on every biome: gridless road tools, road grids placed at any angle in three clicks, individual lanes added along an existing road, plus overpasses, roundabouts, traffic lights, protected left turns, and adjustable signal phases. The simulation is agent-based and microscopic — cars favor the fastest route, factor in congestion, use slip lanes, and try to get into the correct lane before a turn.

Island: The Only Trafficity Biome Named So Far

In a pre-release preview video, creator Exact Chaos opened the new-game menu and found Island available immediately, with two further biome slots locked. He noted the locked entries appeared to be tied to city levels 18 and 25. Because the footage comes from a pre-release key, treat those level numbers as player experience from a build that can still change — the creator says as much on camera.

The Island layout he generated is a good template for what to look for on any map:

• Hills or mountains on one side, since mines must have their rear inside a mountain.
• A lake and beach, because fisheries need the rear of the plot over water and waterfront land is natural residential space.
• Flat ground between them for suburbs, shops, and offices.
• Fertile land for farms, kept away from polluting industry.

He rerolled the random seed until the hills clustered on one edge instead of surrounding the buildable area. That single habit is the most useful thing you can do with Trafficity biomes before placing a single road.

Difficulty Modes Sit Alongside Trafficity Biomes

Map choice and difficulty are separate selectors in the new-game menu. The pre-release footage showed three modes, which line up with the store page's "three difficulty levels."

The procedural generator is the other half of the equation. Because maps are generated, the same biome can hand you wildly different terrain, and the store description's promise of a "never ending supply of maps" rests on that. If a roll gives you mountains in the middle of your only flat ground, reroll.

Reading Biome Terrain Before You Build

Every terrain feature on a Trafficity map maps to a specific building requirement, and each one shapes where your arterial roads should run. The table below reflects placement rules shown in pre-release gameplay.

In the pre-release build, the first level asked for 95% traffic flow and 95% satisfaction, and the creator deliberately kept his primary arterial clear of buildings, feeding it with collector and local roads. Traffic problems showed up within the first several levels, usually at a junction where too many side roads met at once.

His fixes are the ones the store page advertises: add lanes on both approaches, drop in a roundabout, then introduce a signal with custom phases and lane assignments. Road noise became a satisfaction issue near busy intersections, which is another reason to keep heavy flows away from homes on any of the Trafficity biomes.

Practical Tips for Your First Trafficity Biome

• Reroll for a clean edge. Hills on one side, water reachable, flat land in the middle.
• Do not zone on your arterial. Build side streets and place buildings off them.
• Space your junctions. The footage shows closely packed intersections causing queueing and blocking.
• Bank a tile. The creator kept spare map tiles in reserve rather than expanding the moment he could.
• Upgrade before you expand. Fixing one junction is usually cheaper than adding a district.

Launch Status and Platforms

As of 2026-11-09, the official Steam page listed a planned release date of November 16, 2026, noted the game was not yet available on Steam, and showed no user reviews. Kotaku's IGDB-powered game page, captured the same day, listed November 15, 2026; Steam's own page is the safer reference for launch timing. Third-party listings also show announced PC and Mac platforms, for reference only.

FAQ

How many Trafficity biomes are there? The official Steam description, as of 2026-11-09, states there are four biomes, each with a unique playstyle. The page does not name all four.

How do you unlock the locked Trafficity biomes? Pre-release footage showed two biome slots locked and tied to city levels 18 and 25, with Island playable from the start. That is player experience from an early build and may change at launch.

Does the biome change the traffic simulation? The agent-based simulation is the shared core of the game. What changes visibly between maps is terrain — hills, water, and fertile land — which dictates where mines, farms, and fisheries can go and therefore how your roads must be arranged.

Can I play Trafficity biomes right now? As of 2026-11-09, Steam listed the game as not yet available, with a planned unlock on November 16, 2026. Check the store page for live availability.