Terms and Conditions

This website is operated by MAS Solutions Group LLC, 3833 Powerline Rd, STE 601-P, Fort Lauderdale, FL 33309, United States (“we”, “us”). 21 Books and Naka-Toshi are our brands, not separate companies. Full company details are on the Imprint page.

These Terms apply to your use of this website and to every purchase you make here. The version that applies to a purchase is the one published at the time you make it.

We sell digital books (e-books). Each volume is a PDF file that you download from your library on this site after purchase. No physical goods are supplied.

Each volume contains puzzles and clues that form part of the 21 Books journey. Solving them may unlock or advance the next stage of the journey. You can browse the shop and see what is available, and at what price, without an account.

Prices are displayed in EUR before purchase. Any taxes or charges that are required to be shown or collected will be handled in accordance with applicable law and the checkout configuration.

Payment is processed by Stripe, using the payment methods offered at checkout. The contract is concluded when your payment is completed and confirmed; listing a volume in the shop is an invitation to buy, not a binding offer. If a payment fails or is reversed, access to the volume ends with it.

You need an account to buy and to read, and you must be at least 16 years old to open one. We sign you in using a one-time link sent to your email address, so keep access to that mailbox secure and tell us if you lose control of it. Accounts are personal and may not be shared or transferred.

Once payment is confirmed, the volume becomes available in your library and can be downloaded there. Delivery is entirely digital and normally immediate. We may apply reasonable limits on downloads to prevent misuse.

If you are a consumer in the EU or EEA, you have fourteen days from the conclusion of the contract to withdraw from it, without giving a reason and at no cost.

For digital content supplied immediately, this right can end early only if you have given your express consent to immediate performance and acknowledged that you thereby lose the right. Our checkout does not currently ask for that consent, so we do not rely on the exception: the fourteen days apply, including after you have downloaded the volume.

To withdraw, send a clear statement to office@massolutions.io saying which purchase you are withdrawing from. We refund the amount paid within fourteen days, by the same means you paid, and access to the volume ends.

When you buy a volume we grant you a personal, non-exclusive, non-transferable licence to download it and read it for your own use. Copyright and all other rights in the books and in this website remain with us or our licensors.

You may not:

• share, publish, sell, rent or sublicense a volume or your account;
• publish solutions or walkthroughs of the puzzles;
• circumvent technical protections, or use automated means to extract content from the books or the site.

Quoting a short passage in a review or discussion is permitted. If you breach this section, we may suspend or end your access.

The series is built around a puzzle. Please read this section before buying:

• You are buying digital books. You are not buying Bitcoin.
• A purchase does not entitle you to any reward and does not guarantee any outcome.
• Anything that may be derived from the series depends on completing the journey; we do not promise that anyone will.
• The value of Bitcoin can fluctuate significantly, and the availability or contents of any associated wallet are not guaranteed.
• Nothing on this site is investment, financial, legal or tax advice.

The books must correspond to their description and must work as described. If a file is defective, incomplete or will not open, or if the site fails to accept a correct entry, contact us and we will repair or replace it. If we cannot, you are entitled to a refund. Your statutory rights as a consumer, including under EU law on the supply of digital content, are not affected.

We are liable without limitation for death or personal injury caused by our negligence, for fraud, and wherever liability cannot be limited by law. Otherwise our liability is limited to loss that was foreseeable at the time the contract was concluded and typical for this kind of contract.

We do not promise uninterrupted availability of the website. Nothing in these Terms limits any liability that cannot lawfully be limited, or affects your mandatory rights as a consumer.

These Terms are governed by applicable law. If you are a consumer, nothing in these Terms limits any mandatory consumer protection rights available to you under the laws that apply to you.

You can close your account at any time by contacting us. Closing it ends access to your library, so tell us first if you want to download what you have bought. We may also suspend or end access where you breach section 7.

We may update these Terms for future purchases; changes do not affect a contract already concluded. If a change affects an ongoing relationship, we will inform you where the law requires it.

Contact: office@massolutions.io. Company details are on the Imprint page.