From the back cover:
Traps never get old, even when they’re “old school,” and this book has just what the judge needs! This tome contains 150 classic traps, fully developed for DCC RPG rules for the first time ever and ready to be dropped into the nearest dungeon for immediate use. Inside you will find delver dicers, character crushers, adventurer anxieties, minion munchers, hero haranguers, and much more to challenge your players—all crafted by Grimtooth, the trap-master troll, himself!
Grimtooth’s Old School Traps is an homage to the classic Grimtooth’s Traps and Grimtooth’s Traps Too books, updated and expanded for modern RPG tastes. Inside you’ll also find essays from industry luminaries and RPG veterans recounting the impact of these traps on both player characters and the game industry.
The next time your delvers open a dungeon door, hit ‘em with a trap, old school-style. It’ll be the last lesson they ever learn.