From publisher blurb:
Flik Silverpen's Guide to the Errant Tower is a hide and seek dungeon crawl through this portal-filled, non-linear wizard tower. This adventure will work great as a one-shot, but also connects to the Dragon Town / Darkness Below campaign, picking up right where the Fiery Caldera (FSG 07) left off.
A floating wizard's tower watches over a dangerous prison deep underground. Soulless skeletons, talking doors, metallic constructs, and a teasing cat familiar lurk inside the maze of extra-dimensional rooms. The powerful wizard, Lugus Faravald, is casting cruel spells and it's up to the adventurers to figure out the mystery behind the menacing magic locked inside the Errant Tower.
This adventure is filled with whimsical illustrations, a shifting map, a dark mystery, lots of fun magic items, and some seriously weird NPCs. Combat encounters include references to comparable 5E monster stats, otherwise, the zine has everything a DM needs to run this crazy dangerous one-shot!