Castle Of Chronos is an adventure for the low-prep dungeon-crawler system Harper's Quest. It has a strong gamebook feeling, but also uses the roguelite elements that set HQ apart.
The PDF is 9 pages, with lovely old-school illustrations.
Chronos includes clarified rules for attacking and dodging, as well as simultaneous attacks and maybe simultaneous deaths. It's also got a few new creatures, a neat boss, and rules for Entropy and Quantum.
Entropy is the centerpiece of the adventure, and equalizes your stats as it accumulates. Quantum is sort of the opposite, and provides randomized effects.
Overall, this is a solid pocket adventure for HQ. It's got some flavorful fights. It's got a clear and simple premise. And it makes good use of the roguelite mechanics of HQ. Definitely grab this if you also have HQ.
Minor Issues:
-I couldn't find anywhere that explained what causes an Entropic State. 1 or more Entropy? Entropy over HP?
-Do you start with one use of each spell, or you have one use on acquiring them?