Bridge Builder

Get the truck across all eight gaps without losing all three hearts.

Bridge Builder

PhysicsHard 4.5

How to play Bridge Builder

Bridge Builder gives you a gap, a few fixed anchor points in the cliffs, a budget, and a truck of known weight that is already driving towards you. Join grid points with beams — road beams form the deck the truck drives on, wood is cheap and weak, steel is expensive and strong — and watch the clock on the HUD, because when the truck reaches the gap it drives across whatever you have built. Send it early and the seconds you did not need become points.

The structure is simulated rather than scripted. Joints have weight, beams hold their length, and the truck's wheels press down on the road beams they are rolling over. Every beam's strain is measured as the truck crosses and shown in colour, from green through yellow to red; a beam pushed past its material's limit snaps and its load moves on to its neighbours. A plain deck sags and tears, a square frame folds up, and a triangulated truss holds.

There are eight levels. The gap widens by a cell each time, the truck gets heavier, the build clock gets shorter and the budget grows more slowly than the job; two levels give you a rock pier in the middle. If the load ends up in the gorge you lose one of three hearts and go back to the drawing board with your design intact.

Objective

Get the truck across all eight gaps without losing all three hearts.

Features

  • Road, wood and steel beams with different costs and strengths
  • A Verlet simulation where overstrained beams snap and loads redistribute
  • Live strain colours on every beam while the truck crosses
  • A visible truck on a clock — send it early for bonus points
  • Eight levels of wider gaps and heavier loads, two with a rock pier

Keyboard

←→↑↓Move the build cursor
SpaceStart a beam at a joint, then place its far end
123Road, wood or steel
ZBackspaceUndo the last beam
XDeleteRemove the beams at the cursor, or cancel a beam
EnterGSend the truck now

Touch

DragDrag from a joint or anchor to build a beam
TapTap a beam to remove it
ButtonsPick a material, undo, or send the truck
CATEGORY
Physics
DIFFICULTY
Hard
EDITOR RATING
4.5 / 5
LOCAL HIGH SCORE
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TIMES PLAYED HERE
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Scores are saved in this browser only. There is no global ranking and nothing is uploaded.

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