Books anybody can buy

Named editions sold openly, so a household, a class or a puzzle club can all work the same register at once, compare where they have got to, and argue about it. Most books on this site are sold to one buyer only; these are the ones made to be shared.

Everyone in the group buys their own copy, on their own account, and gets the PDF and their own saved progress.

Because more than one person owns these, an answer to one can circulate. If you would rather hold the only copy in existence, take the short book or the long one instead.