From the Introduction:
I've always liked a sand-boxy approach to a campaign, where the PCs are adventurers, wandering swords for hire, seeking treasure and excitement, rather than having some huge over-arching plot and grand plan. However, to help keep the game moving along as the players decided where to wander next, I found that rumors, small encounters and side-trek adventurers were a necessity. That need spawned an awful large number of lairs. Initially I bundled them all up together, but the result was an unworkably large document. I then broke up the lairs by the level of characters the encounter was intended to challenge; which resulted in a much more manageable document.
This document contains adventures that are intended to challenge low level characters (levels 1 to 4). There are very few encounters for 1st level characters; I tend to start play at 2nd level so 1st level encounters aren't something I need.