Puzzle Path (6 caches in Sackville)
Nictaux Puzzle Trail (26 caches in Nictaux)
Puzzle Street (51 caches near Bridgewater)
Micro and mega logics (40+ caches in Wolfville-Kentville area)
The 81 (81 caches east of the Halifax Airport )
EZ4U (8 caches in Dartmouth)
Flyer Trail (6 caches in Dartmouth)
Geo Trivia (10 caches near Havre Boucher)
(See also the Geo Art page for more series of puzzles. Also here's a list of NS challenge caches)
How Do I Solve all of these Puzzle Caches? (a general tutorial on puzzle caches, in Middleton area)
Puzzles by "prolific puzzlers"
This link to Project-GC will list the cachers with the most puzzle caches in NS.
Links to caches by prolific puzzlers (20 or more caches of "Unknown" type, excluding archived, including disabled):