[cbk1994]

As far as I know there are only summer, autumn, and winter tilesets. The dev kit you can download contains all three of these. There are some additional tiles that are added via adddef2, but these are only for the mines and a couple other special levels.

The dev kit contains a level which will set the tiledefs for you if you open it. The tilesets in the dev kit are a bit outdated, however. I'll request rights to fix that.