Huff 'n Puff is the most difficult trail at Dauset Nature Center
with some elevation change beneath a pretty dense forest. The singletrack in the first half of the trail is particularly narrow. There are a lot of moderately challenging root bundles, a few rocks, and several 2-4 foot dips and rises. You could probably jump off a few of the dips, but they are all rollable too.
The second half of the trail becomes easier. There are a few places where there are drainages across the trail, so expect a few soggy areas if it has rained recently.
If you're following the trail markers, follow: 21 > 22 > 23 > 24 > 8 > 21.