Before you turn to the solutions

Check your solution without reading it

Every case has a check code, printed beside its hints. Work it out from your own placement and type it here: you will know whether everyone is where they should be, and the solution stays unread.

How the code works

Number the suspects in the order of the panel on the case page (1, 2, 3 and so on), multiply each number by the row where you placed that person, and add up the results. That is your check code. Swap any two people and the sum changes, so a wrong placement is caught.

The codes come from the same certified solutions as the books: before printing, proprietary software tried every arrangement of every plan and kept the one that fits all the clues.

Need help?

Write to us

A question about a book, an order, a code that will not work: write here, and a person replies by email, usually within a couple of days.

PLANIGMA - help (EN)

You get a confirmation email at once; the reply comes by hand within a couple of days. Check the spam folder too.