What do you mean exactly? I did create a small puzzle map. And yeah I figured that about the strings, probably why you are only able to get 7 bits out of every character yes?

Ah that sounds like a good way to do the object positioning. I was envisioning a different scheme, in which some sort of run-length-encoding might have been useful, but your method is a great way to cut memory as well. There might be a way to incorporate some sort of compression to save some space but considering your storage scheme I think it probably would end up not being worth it.

Do you think it would be worth it to compress the 700 or so bits you are using to represent the walls? Also are you currently implementing a version number in one of the available ints so you can change the syntax if you please?