PortalSpan: Bridge Builder

PortalSpan is a structural engineering puzzle where every bridge is built, braced, and load-tested for real. Drag between portal pairs to lay a full-width road deck, then add steel chords, timber bracing, concrete supports and suspension cables. The game shares one set of joints across every material, so the deck and the truss behave as one structure. When you press TEST, a vehicle crosses the span while live stress colours reveal what is carrying the load and what is about to let go. BUILD LIKE AN ENGINEER • Portal-to-portal construction: one drag builds both sides • Full-width 4 m deck with steel, wood, concrete and cable • Vertical posts and diagonal trusses, not just flat road pieces • Undo and redo every gesture WATCH PHYSICS DECIDE • Real-time stress, strain and structural failure • If one supporting member snaps, the deck follows it down • Load-test camera follows the vehicle across the gap • Score budget, strength, weight, time and safety DESIGNED FOR TOUCH • Large, readable build controls • Snap-to-grid joints and clear validity previews • Portrait and landscape support • No account, no timers, no ads THREE SITES, ONE VALLEY Cross the Highland Gap, then continue into the Cedar Creek and Canyon Crossing sites as the campaign opens. Sandbox mode lets you experiment without a budget. PortalSpan is an original bridge-building game built with Three.js and Rapier physics. Every collapse is simulated, not scripted. Build a span that holds. Then build a better one.

First release of PortalSpan. • Portal-pair bridge builder with shared structural joints • Full-width 4 m road decks • Steel, wood, concrete and suspension-cable members • Vertical and diagonal truss construction • Real-time load testing and cascading failure • Three campaign sites and sandbox mode • Offline play, no ads and no in-app purchases