These 3 sketches are different ways to design the "metal pieces" described in the story board:

This first sketch is similar to what's seen in the storyboard. There's a touch sensitive area that makes up the majority of the piece so that it's easy to touch and activate. The smaller display region lights up green or red depending on whether it's a good or bad piece. It displays the number when you look at it straight on as well as if you were to look down at it, so that those who are climbing can still see numbers below them.