I'm working on an extension to a game - adding a lot of jpgs to the zip file. So anyone know just how big something like this can be? I don't want to put a lot of work in and get locked out on size.

I have no experience of Squiffy, but I do know there is a 20 Mb limit for uploads to TextAdventures, and I am fairly sure that will be your limit.

The zip file I just loaded was 21mb. It went in fine. If that's true, I'm wondering how much further I can expand it.