Crossnumber puzzles are like crosswords, but the grid is composed completely of numbers. The clues can be completely mathematical, or something as mundane as area codes, or the year of a hit single. The purpose of this compendium is to gather clues for each of the whole numbers 1 and greater that can reasonably be put in a crossnumber puzzle. It's possible for a 13-digit or even higher number of digits number, but the typical number length is 1-6 digits. Though not many puzzles have 1-digit values in the grid, this compendium starts with 1. Eventually, people from the world over will be able to contribute to the compendium, but for now, clues will be added by the author.