Tollenkar's Lair is a complete, ready-to-play labyrinth for The Fantasy Trip in six levels.
When Howard Thompson published The Fantasy Trip in 1980, he felt that the price point was too high, and so he split the game into four books: Advanced Melee, which contained the combat extensions to Melee; Advanced Wizard, which contained the extensions for the magic system; In the Labyrinth, which contained the rules for the gamemaster; and the adventure Tollenkar's Lair, which author Shannon Appelcline described as "a 'stocked labyrinth' (or GM adventure)".:79–80
Karl Mueller reviewed Tollenkar's Lair in The Space Gamer No. 31. Mueller commented that "This adventure is a must for most Fantasy Trip GMs, especially beginning ones, both as a campaign in its own right, and as an example of what can be done with a TFT dungeon design."
- Mueller, Karl (September 1980). "Capsule Reviews". The Space Gamer. Steve Jackson Games (31): 26.
- Schick, Lawrence (1991). Heroic Worlds: A History and Guide to Role-Playing Games. Prometheus Books. p. 156. ISBN 0-87975-653-5.
- Shannon Appelcline (2011). Designers & Dragons. Mongoose Publishing. ISBN 978-1-907702- 58-7.
- Steve Jackson Games (July 23, 2018). "THE FANTASY TRIP – Old-School Roleplaying!". Kickstarter. Retrieved July 27, 2018.