BRIDGE BIULDER 1.0 This is a simple tutorial how to “grasshopper” a game for yourself. 1. We are in need of : LEVEL difficulty slider, road/rails fragments, constuction fragments… (for expert level – > you can do your own) 
2. To choose level I used “FILTER” connected to a cluster of point specifieing length of the gap. 
3. Simple geometry into line that is extruded in the end. (can be extruded to infinity and beyond…) —-> when level is picked, BAKE IT! 
4. In side view You can draw a line(s) that you desire to be a road/rails and set them as “ROAD”. This following script (cluster) divides it into fragments, extrusions, support points and load points. 
(B and C are connected to “ROAD”; Right side R=beams, W=load points, Ex= Extrude to preview (just for the color), E = support points) 5. In side view You can draw a line(s) that you desire to be the construction and set them as “CONSTRUCTION”. The following script (cluster) divides them again into seperate beams. 
6. Now we need to evaluate it with Donkey 
7. Let us do some more with the evaluation. You can set the color of the terrain (extrusion in step 3) according to the result of your try. 
8. For testing purposes you can add “GALAPAGOS” to the formula to make sure levels are hard enough.
9. As a final step you can model a train in rhino and let it test the bridge.
Final result as I was playing :
