Maze Walls/Help

Hi, I need some help with a maze app.

How do I 

A. make walls for a maze so a sprite cannot go through them

B. Customize the location of each wall piece 

C. Make the sprite able to collide with the wall but not bounce while doing so

Any tips/advice would be greatly appreciated. 

one of these threads https://groups.google.com/forum/#!searchin/app-inventor-developers-library/maze might help

Another place to look is here:   http://www.appinventor.org/Chapter17   for general animation advice.

Thanks everyone who helped :D