Bridge 7 has a simpler solution that meets all 5 criteria at once using only wood.

For bridge 7 and possible others maybe try launching truck as soon as possible.

Thank you! Great work!

B7 can be done so that a single bridge will work for all five challenges.

Bridge 8 (all wood) did not work on my system (PC). I was able to squeak by at 98% by adding more reinforcements in spots and removing it from others. This isn't the only one on Island 2 that didn't work on my computer. I wonder if they've made the game a little harder since these were posted? We'll see if island 3 follows suit.

Weird. B7 works fine on PC version for me.

B2 works fine, or at least very close to it for me.

Bridge 2 (pic 3) gave me the "Throw Away Bridge" achievement.

bridge 7 not working, this one woks fine https://bridgeconstructorguide.com/wp-content/uploads/2013/04/Bridge-Constructor-Playground-Northern-Reef-Bridge-7-Solution-B.png

thanks a lot

I bet that wood-only Bridge 8 gave you quite a hard time. lol