Blue = tension (pulling)Amber = compression (pushing)Red = overload – about to snap
Choose a crossing
Finish a level to unlock the next. Beat your best cost for more stars.
How to build
Pick Joint or a material (Timber, Steel, Cable, Road) and click grid dots. A member snaps between two joints; click an empty dot to create a joint on the fly.
Road is the drivable surface and must connect the two yellow road anchors. It is weak, so run a Steel/Timber beam along it as a bottom chord and triangulate above or below.
Cable only pulls, never pushes, and is cheap and strong. Long compressed members buckle, so keep them short.
Analyze loads the heaviest vehicle at any spot and shows stress live. Test drives the full convoy over the real physics.
Right/middle-drag pans, wheel zooms, Alt+drag orbits, V toggles blueprint/3D. Ctrl+Z/Y undo/redo, Del erases the selection, Esc cancels.
Shortcuts: S select, J joint, 1-4 materials, E erase, T test, A analyze.