To build a bridge, select the material you want to use from the menu. Then click on the starting point and drag your mouse to the endpoint to create your bridge structure. Adjust supports as needed.

The key materials include wood, steel, and cables. Wood is flexible and easy to use, steel is strong for heavy loads, and cables provide tension support, essential for long spans.

After building, click the play button to test your bridge. Vehicles will cross, and if the bridge collapses, you can analyze the failure point and adjust your design accordingly.

For tougher levels, consider these strategies: 1. Study the car's weight and type. 2. Use a layered structure for support. 3. Experiment with different materials for balance. 4. Use the simulation to refine your design.

Unlocking new levels is achieved by completing earlier ones successfully. Focus on meeting the criteria for each level, such as budget and vehicle types, to progress to the next challenge.