At around #220, I realized I was making many grave errors, most notably, not extending the lines correctly. To get more practice, I plan on adding 5 boxes to my warm-up pool, however, I also think it might be necessary to re-do all or part of the 250 box challenge before continuing, I'm interested in an outside opinion on this.

Apologies for missing pages, I forgot to take a photo of some, and to put it lightly, I am not good with keeping track of paper!