I think the cave sets are the most useful of the E-Adventure Tiles because mapping caves is always a pain for the gamemaster or player. This makes it easy to map out a rats maze of Cave Passages.
This is a passage set meant to connect to the various cave chambers. That said, there are 4 small caves and about another 4 to 6 tiles that would make acceptable encounter areas. The set by itself is nice for a small tight cavern system with occasional 15x15 encounter areas. If pressed for money you could combine this set with the free Fungus Caves set.
LIKED: Nice looking easy to lay out group of cave tunnels.