WHAT GAMES LET YOU BUILD CARS FROM SCRATCH?

There's a specific itch that "build a car game" usually tries to scratch, and most of the games you find when you search that phrase don't actually scratch it. They let you swap parts. They let you tune a stock car. They let you pick a chassis from a menu and slap body kits on it. That's not building a car. That's shopping.

I'm talking about the kind of game where you start with nothing, or with a pile of parts, or with a blank engineering canvas, and you end up with a vehicle that wouldn't exist if you hadn't made it. That's a narrower category than it sounds, and the games in it approach the idea in wildly different ways. Some make you set the bore and stroke of an engine. Some make you physically carry the cylinder head across a barn. Some let you weld a structural frame from scratch and see if it holds together at 80 mph. They're all "building cars from scratch," and they're all completely different experiences.

Here's what actually qualifies, in my opinion, and what each one means by "from scratch."

Automation: The Car Company Tycoon Game

Automation is the deepest answer to this question that exists. When I say "from scratch" here, I mean literally from scratch. You start by picking an engine block configuration. Inline, V, flat. Number of cylinders. Bore and stroke, which determines your displacement. Head type. Valvetrain. Fuel system. Aspiration. Compression ratio. Cam profile. Every one of those decisions rolls into a simulated dyno pull that tells you how much power you made, how much torque, what the fuel economy is, and how reliable the engine is going to be under load.

Then you do the same thing with the car around it. Chassis material, wheelbase, suspension geometry, brake setup, interior quality, safety rating. You attach body panels to a pre-made shell and shape the aesthetic with grilles, headlights, vents, wheels. You're not picking "small sports car." You're engineering a specific small sports car with specific numbers attached to it, that will perform in a specific way on the test track.

The thing Automation captures that nothing else does is the feeling of making engineering tradeoffs. Crank the compression up and you get more power. You also get worse reliability and you need higher octane fuel which costs your customers more at the pump. Run a long stroke and you get low-end torque at the cost of redline. Pick aluminum for the block and it's lighter but more expensive to manufacture. Every slider you move changes four other numbers on the screen. That's what building a real car feels like, apparently, and I'm here for it.

The downside is that you're not driving. The test track is automated. You watch a lap time happen, you don't execute one. If you want to drive what you built, you can export it to BeamNG.drive, which is the cheat code most of the community uses. Build in Automation, drive in BeamNG. That combo is the closest thing to a complete car building experience in games. I wrote a longer Automation review if you want the full breakdown.

My Summer Car

My Summer Car takes "from scratch" literally in a way that nothing else does. You are in a shed in rural Finland. There is a Datsun 100A, reskinned as a Satsuma, in several large wooden crates. You are going to bolt it together. Yourself. By hand. In the correct order.

If you tighten the cylinder head bolts before installing the head gasket, the car won't run. If you install the head gasket backward, the car won't run. If you forget a single bolt, which you will, and take it for a drive anyway, pieces will fall off while you're moving. I watched my engine detach from the chassis because I hadn't torqued the motor mounts properly. It lifted up through the hood as I accelerated. Ten hours of progress, gone, because I skipped a step in a service manual that the game does not actually provide you.

That's the charm. My Summer Car makes you feel the weight of assembly. Not the abstract weight, the literal weight. You pick up parts and carry them across the yard. You drink coffee and beer to stay conscious. You have to pay bills and avoid dying. It's a survival game where the survival part is called "building a car" and the car part is called "do not die." There's a whole subgenre of games that chase this feeling now. I wrote about games like My Summer Car if you want more in that style.

Wrench

Wrench is the one most people sleep on because it's a VR game and the audience is smaller. That's a mistake if you have a headset. Wrench is the most hands-on building experience I've found in any medium, including real life for anyone who hasn't actually worked on a car.

You reach into an engine bay. You physically rotate a wrench around a bolt. You drop a socket and it rolls under the car because of course it does. The detail level on the vehicles is serious. You're installing individual pushrods, setting valve clearances, timing cams, routing coolant lines. Each car in the library is modeled deep enough that you could do a legitimate teardown on it and learn something about how that specific chassis actually works.

The downside is scope. Wrench focuses on the build itself. There's no driving, no economy, no survival layer. You're in a shop and you're working on cars, and when you're done you're done. For some people that's perfect. For others that's missing the payoff. It's a purist's answer to this question.

Main Assembly

Main Assembly is the Kerbal Space Program of vehicle building. You don't pick a chassis, you build the chassis. Structural beams, hinges, pistons, motors, wheels, armor panels. You connect power systems. You wire control inputs. Then you hit play and see if your thing drives, or crashes, or flies, or disassembles itself the moment physics engage.

Calling what Main Assembly produces a "car" is generous, because the game doesn't care if you build a car. You can build a tank, a helicopter, a walker, a submarine. But if you want to build a car from absolutely nothing, this is the most literal interpretation I can think of. Nothing is pre-made. Every piece of your vehicle is something you bolted into place relative to other pieces. The steering geometry works because you made it work. The suspension compresses because you set up the piston travel correctly.

This is the game where "from scratch" starts to mean "including inventing the concept of a wheel." It's a different kind of satisfaction than Automation. Automation lets you engineer within a realistic framework. Main Assembly lets you invent your own framework and then see what happens. Most of what happens is hilarious failure. That's the fun.

Trailmakers

Trailmakers is Main Assembly's more approachable cousin. Same core idea, you build vehicles out of individual parts, but the parts are more purpose-built and the onboarding is gentler. You can build a reasonable car in fifteen minutes. You can also build something ridiculous in three hours and enter it in community racing events.

The thing Trailmakers does well is expeditions. There's actual campaign content that asks you to build a vehicle capable of crossing specific terrain, then crosses it. Your design either survives the trip or it doesn't. You're not just building in a vacuum, you're building for a purpose, and the purpose pushes you into design decisions you wouldn't make if you were just playing in a sandbox. That feedback loop is what makes it stick.

It's less of a "car" game than the others on this list. Most of what you build in Trailmakers doesn't look like a car. But the building-from-nothing element is pure, and if you want that experience with less of Main Assembly's steep curve, this is where I'd send you.

My Garage

My Garage sits in a middle position between Automation's spreadsheet engineering and My Summer Car's physical assembly. You're in a garage, you've got an engine on a stand, you're building it at the component level with real-ish parts in a 3D space. You install pistons into the block, connect rods, drop the crank in, bolt on the head. The order matters, the parts interact, but the game doesn't punish you as hard as My Summer Car does for getting it wrong.

Think of it as My Summer Car with less existential dread. You're still hand-building. You're still dealing with parts that you carry around and install one at a time. But there's no drinking simulation, no bills, no sauna management. It's the assembly itself, focused.

LEGO Technic style racer games

This is a category more than a specific game, and the biggest name in it is probably BRICK RIGS, though it's more destruction-focused than pure building. LEGO 2K Drive has elements of this too, with a garage system that lets you assemble vehicles from Lego parts. The appeal is obvious. It's the same impulse that made you build a Technic supercar when you were twelve, except now the thing actually drives and you can crash it into other things that also drive.

The "from scratch" claim is looser in this category because you're working with pre-shaped Lego-style pieces rather than engineering components. But you're still building, and the modular construction means you can experiment with configurations that would be impossible in a more realistic simulator. Want to put tank treads on a sports car? Go ahead. Want to add rocket boosters? Sure. It's building from scratch within a specific toy-box framework, which is a valid interpretation of the concept.

Car Mechanic Simulator

I want to include this with an asterisk. Car Mechanic Simulator is more about repairing than building, but the auction system and the barn find mode change the calculation. You can buy a wrecked vehicle that's basically a frame and a pile of parts, then reassemble it into a running car. That's "from scratch" by a technicality, since the frame already exists, but functionally it's similar enough that I'd count it.

The reason it doesn't rank higher is that the parts are abstracted. You don't install individual pistons. You install an engine block, which is a single object. The depth is in the variety and the business simulation, not the build itself. If you want the act of assembling to be the focus, go to My Summer Car or Wrench. If you want to do dozens of builds in a row and watch a garage turn into a business, Car Mechanic Simulator is your answer. I covered this one more fully in my car builder simulator games writeup if you want more context on where it sits.

What "from scratch" actually means

The word "scratch" does a lot of heavy lifting in this category. Different games pick a different floor for what counts as the starting point.

In Automation, scratch means a blank engineering slate. You specify the car down to the physics. Nothing exists until you define it.

In My Summer Car, scratch means a pile of physical components in a shed. The parts exist. The car doesn't, until you put the parts together in the right order.

In Wrench, scratch means an empty engine bay and a shop full of tools. The chassis is there. The mechanicals are not.

In Main Assembly, scratch means a completely empty build space and a menu of primitive building blocks. Even the concept of "wheel" is something you have to implement.

All of these are legitimately building from scratch. They're just answering different questions about what that phrase means to you. If you want engineering depth, Automation. If you want hands-on assembly, My Summer Car or Wrench. If you want to design the vehicle concept itself from primitives, Main Assembly or Trailmakers. If you want something in between, My Garage.

My honest recommendation

If I had to pick one game to recommend to someone who asked me "which game lets me build a car from scratch" and wanted the maximum payoff, it would be the Automation plus BeamNG combo. You get the deepest engineering, you get to drive what you built, and the community has decades of shared builds to learn from.

If the person wanted something more visceral and weird, My Summer Car every time. It's a cult game for a reason, and the reason is that nothing else makes you care about a Datsun 100A as much as it does.

And if the person had a VR headset and wanted to touch the tools, Wrench. The sensation of physically working on an engine translates in a way that screen-and-mouse builders can't match.

Every one of these games scratches a slightly different part of the same itch. The good news is that you can buy all of them for less than the cost of a single real engine rebuild, which is probably the correct way to frame the value proposition of any of these games.