From publisher blurb:
Transitions is not a halfway house for abused orcs. This sixteen-tile set depicts connections between various hallway types, standard tunnels and caves, grand hallways and caverns, and sewer tunnels. Nothing hidden here, so there are no GM versions of these tiles.
The Dungeons in Blue series brings classic blue maps to the virtual tabletop! These ready-to-fill maps are packed with rooms, corridors, pits, and caves; all judiciously sprinkled with tricks and traps. Every geomorph tile seamlessly connects to every other tile in the series, providing the megadungeon builder tremendous freedom and flexibility.
This set includes sixteen 50x50 foot tiles, along with the usual map legend, preview image, and PDF readme. All maps are ready-to-use PNG-format files compatible with most virtual tabletops. Use them as-is, or combine them into larger maps using your favorite image processing software.