Good to know
Frequently asked questions
When do I get it?
Right away. As soon as you pay, you land on a page with a button to download your book, and we also email you the same link so you can download it again whenever you like.
Do I have to finish it in a set time?
No. The book is yours, and you use it at your own pace, with no deadlines or pressure. Do one session a day, a few a week, or as many as you like.
What are the two volumes?
The book is split into two volumes: Volume 1 (days 1 to 30) and Volume 2 (days 31 to 60). Both come in a single PDF, and the numbering continues from one to the other.
Do I need to print it?
No. You can solve it on your phone or tablet with any app that lets you write on a PDF. If you prefer paper, you can print each volume separately on standard US Letter paper (8.5 × 11 in).
What if I don't like it?
You have a 15-day guarantee. Write to us from the contact page and we'll refund your purchase.
Is it hard?
No. The level goes from easy to medium, in large print and with no time limit. If something stumps you, the answers for each day come right after.
Can I buy from outside the United States?
Yes. Prices are in US dollars, and your bank converts the amount to your own currency at checkout.
Is it a medical book?
No. It is an entertainment and mental-exercise book. It does not diagnose or treat any condition, and it is not a substitute for a doctor's visit.
