This spooky book-focused cosmic horror mini-TTRPG for 1-4 players squeezes a good amount of content into its trifold format.
Character creation is fast and easy, the random tables provide plenty of ideas to kick off an adventure, and the gameplay mechanics are straightforward to grasp - perfect for a quick one-shot game. It's available in either English or Spanish.
There are some minor grammatical errors in the English version, but nothing that makes it hard to understand the intended meaning. A quick edit could help the writing to feel as polished as the ideas.
I particularly love the table of 36 possible book features, which range from the mundane (e.g. 'forgery', 'signed by the author') to the mysterious ('encrypted message', 'invisible writing') all the way to the nightmarish ('mesmerising curse', 'sentient and evil')!
The text contains numerous unexplained references to aspects of the Lovecraftian mythos (e.g. 'The King in Yellow', 'The Necronomicon', 'The Pnakotic manuscripts', 'Carcosa', 'The Dreamlands', 'Hastur', 'Y'Golonac', 'Quachil Uttaul', 'Cthulu'...), so ideally you will want at least one player to have a passing familiarity with these concepts. Alternatively, while the Lovecraftian mythos is a clear inspiration, it wouldn't take much tweaking to transform it into a different fandom - for example, a Magnus Archives-inspired version where you hunt down Jurgen Leitner books that tie back to the Fears.
As is typical for Lovecraftian content, there's a basic 'sanity and madness' mechanic that may frustrate those who prefer more nuanced portrayals of mental health conditions. Reskinning this as 'supernatural corruption' is one possible approach that may help.
Overall, this is a great resource for running a quick cosmic horror game full of ominous books. 4/5 stars - excellent.