FEAT — Bridge & Structure Engineering

Build. Test. Find the weak point.
Design bridges, roofs, towers and cranes, choose your materials and cross-sections, and make your structure work within the contract's budget and mass limits.

Then put it to the test: trucks cross your bridge, snow loads your roof, wind hits your tower, and a crane lifts its cargo. Watch the forces move through every member. Blue means compression; orange means tension.Understand the failure. Improve the design.
When a structure gives way, FEAT highlights the first member that failed and shows the collapse. Find the weak point, change your design, and run the same load again. Aim for a structure that survives, then refine its cost, mass and utilisation for three stars.

You can learn as you build. Everyday examples and a bridge lab explain the forces behind your decisions, one change at a time.Four materials, four personalities
Steel — strong both ways, but pricey.

Timber — cheap and light, but brittle in tension.

Concrete — cheap in compression, cracks in tension.

Reinforced concrete — takes compression and tension, but it is heavy.
What is inside
A campaign of 40 contracts in four worlds — Valley, Quarry, Coast and Alpine Passes: bridges, snow-loaded roofs, towers in wind storms and cranes.

Engineering heritage — 20 famous structures on a globe: the Forth Bridge, the Royal Albert Bridge, the Garabit Viaduct, the Eiffel Tower, and Tower Bridge with other movable bridges that open for passing ships.

Two collections of real-world trusses — 21 levels from industry, energy, the city and leisure: a tower that catches a landing rocket booster, a Big Air ramp, a Ferris wheel, a chairlift tower and more.

Roller coasters — 10 levels where the track is fixed and you engineer the structure that carries it.

Sandbox and level workshop — build anything, design your own levels.

Learn by building — a short course explains every idea with everyday things (a drinking straw, a ruler on two books) before it gets a name, and a bridge lab lets you test one change at a time.
Real engineering behind every test
FEAT uses a custom finite-element (FEA) solver written in Rust. Cross-sections, materials and member lengths affect the result: slender compressed bars can buckle, steel can yield, and brittle materials can fail. Nonlinear dynamics simulates the collapse after a failure.Same design, same result — bit for bit
The simulation is fully deterministic. An identical design under an identical load gives an identical result: the same verdict, the same moment and place of failure, the same wreck. That is what makes the star ratings for cost, mass and utilisation fair.Made by an engineer
FEAT is made by Owlnut, a one-person studio run by a civil engineer who started the project about ten years ago and came back to finish it.