As another quick followup, if you follow this thread on the forum, there is an example of how to create a group that contains multiple sprites. You could create a group called “walls” and add all of the individual walls to the group, and then you could set the collision rules with the “walls” group so you didn’t have to check collision with each wall individually. This seems like the most efficient way to handle it, although I am sure there are other ways.
Hope this helps.
Mike