Kung Fu Panda 2

The easiest place I found to collect these pieces of metal is on the rickshaw challenges. Finish story mode to make sure you unlock all the challenges available. Then go into 'Free Play' mode and find a rickshaw challenge. There should be 4 or 5 to choose from. There are three (3) difficulties to choose from:

Easy - Iron pieces
Medium - Steel pieces
Hard - Gold pieces

Choose your favorite (or easiest) rickshaw challenge and go to town. The pieces that glow on the ground are the pieces of iron, steel, and/or gold. Pick those up, finish the challenge, rinse and repeat.

This is the same solution for:



Good Luck!

I found that after completing the story and working on gold medals for each challenge at each difficulty this amount of steel came naturally long before I finished them, so I wouldn't worry too much about grinding it out

Steel is found on NORMAL difficulty challenges