Changeable material costs

[pulsejet5]

That would be a great idea. It would increase the amount of unique bridges http://www.pontifex2.com/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[amos]

How about making material costs changeable. For example, I could design a level in which cables are expensive but light steel is cheap. This small change could motivate very different bridge designs.

-Amos