FAILSPAN: Structural Mayhem

Build real-physics bridges in 2D or 3D, from Class 1 to Expert Engineer: answer your class's questions to earn parts, then test the bridge with traffic. Build. Stress. Snap.

Sixteen buildings on one road: Class 1 to 12, BE, NIT, IIT and Expert Engineer. Each building has only its own question bank (53,000+ questions: physics, chemistry, maths, biology, EVS, computer, commerce, economics, engineering and a bridge quiz for every project) and its own bridge to build, from a simple cable bridge for Class 1-7 to a two-pylon convoy bridge for IIT and Expert. A real stiffness-method truss solver checks every member for snapping, crushing and buckling as the vehicle drives across, and force arrows show the physics at any joint. English and Bengali, questions read aloud for Class 1-3, guided steps, hints, stars, unlocks, badges, a daily streak, a weekly bridge challenge and a printable report card for teachers. Play in 2D or 3D: the 3D view puts your bridge over a sunset canyon, drives real 3D vehicles across with a live stress meter, and shows every snap with sparks, debris and slow motion. Works offline once loaded.

How to play

Pick your class, tap its building, answer questions to earn parts, tap two joints to place a member, then press Test bridge. Guide, Hint and Show me lead you step by step; Forces shows the pushes and pulls at any joint.

Kids · Made by Md. Saiqul Haque Modi · GitHub · Added 2026-11-01 · Free, no install, works on a phone