Vault of Echoes: A Puzzlebook for Thinkers, Solvers, and Seekers

Vault of Echoes: Volume I is a lore-infused puzzle codex designed to test rigorous reasoning. The volume contains 25 original, self-contained puzzles spanning probability/inference, logic and constraint systems, number theory, combinatorics, algebraic structures, and geometry. Each puzzle is presented in a consistent format (Lore, Puzzle, and a strict "Vault Directive" specifying the required output) and the book includes worked solutions. This Zenodo record archives the First Edition PDF for citation and long-term access. The collection can be used both as a puzzle book for human solvers and as a fixed prompt set for UI-native, single-shot evaluation of chat-based LLM systems. The work is commercially published and remains under all rights reserved; this record provides archival citation metadata and access under the stated license.