From publisher blurb:
What we have here is a series of tables designed to be used by GMs and solo players in dungeon exploration adventures. There are 100 descriptions of 100 different rooms, each with a suggestive name (sometimes rooms with similar functions will have the same name, but the description will be different for each one), which is the heart of this material.
Often, the room description itself will make it clear what the contents are, whether it's a trap, monsters, treasure, etc.
However, if this is not specified, there are a series of tables to help "bring to life" this dark location. Roll on these tables as many times as necessary.
This material can easily be used with the vast majority of fantasy games, especially those of the OSR movement, as well as the most famous RPG of all.