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30-Day Challenge Terms and Conditions
Last updated: 19 August 2026
These terms set out the conditions for taking part in the 30-Day Challenge prize competition, run by Zelthy, operated by Huxia, Lda. Registration implies full acceptance of these conditions.
1. Who runs the Challenge
The 30-Day Challenge is run by Huxia, Lda., a private limited company with registered office at Rua dos Ferradores 39 B e C, Zona Industrial de Vilamoura, 8125-498 Quarteira, Portugal, corporate body and tax identification number 516 021 818, trading under the brand Zelthy Nutrition.
These terms remain available for consultation throughout the Challenge and for 60 days after the prizes have been delivered.
2. What it involves
The Challenge consists of solving four logic puzzles, which we call cases, sent by email at a rate of one per week over 30 days.
Participation is free and subject to no obligation to purchase. Participants are never asked for any payment or to buy any product.
The cases are solved by reasoning and the clues contain everything needed. The draw serves only to select the winners from among those who solved them correctly. The Challenge is not a game of chance and involves no wager or financial consideration.
3. Who can take part
Participation is open to people aged 18 or over resident in Portugal (mainland, the Azores and Madeira) or in Spain, who have a valid email address.
Each person may register only once, with a single email address.
Employees of Huxia, Lda., their spouses, civil partners and relatives in the direct line or up to the second degree of the collateral line may not take part, nor may employees of the companies involved in producing the Challenge.
4. How to take part
Registration is done by completing the form available on the 30-Day Challenge page at zelthynutrition.com.
Each week participants receive by email the link to that week's case and solve it on the relevant page. There is no limit on attempts within the deadline.
A case is considered solved when the correct solution is submitted before the deadline closes. Only answers recorded in our systems by that moment count.
Each case solved within the deadline gives one entry into that week's draw. Solving all four cases gives one entry into the final draw.
It is possible to register after the start. In that case the participant receives the case currently running and those that follow, but not cases already closed. Registration closes on 11 October 2026 at 23:59.
Registration entails subscribing to the Challenge mailing list, without which the cases cannot be received. Participants may unsubscribe at any time using the link in every email; unsubscribing ends participation, without prejudice to prizes already awarded.
5. Schedule
The Challenge runs from 15 September 2026 to 12 October 2026. All times shown are Lisbon time.
- Case 1: opens Tuesday 15 September at 09:00 · closes Sunday 20 September at 23:59 · draw on Monday 21 September
- Case 2: opens Tuesday 22 September at 09:00 · closes Sunday 27 September at 23:59 · draw on Monday 28 September
- Case 3: opens Tuesday 29 September at 09:00 · closes Sunday 4 October at 23:59 · draw on Monday 5 October
- Case 4: opens Tuesday 6 October at 09:00 · closes Sunday 11 October at 23:59 · draw on Monday 12 October
The final draw takes place on 12 October 2026.
6. Prizes
Weekly prizes
In each of the four weeks one store credit coupon is awarded for use in the online shop. The value of each coupon and its period of validity are stated in the communication for that week's case.
Coupons are personal and non-transferable, valid only at zelthynutrition.com, cannot be combined with other promotions and cannot be exchanged for cash. The same person may win more than one weekly prize.
Final prize
Three final prizes are awarded, to three different winners. Each prize consists of six months of Bullet Coffee, that is six 300 g tins.
The retail value of each final prize is 165 €, for a total of 495 € in product, at the retail price in force on the date these terms were published.
The prize may be delivered in a single shipment or in stages over six months, as agreed with the winner.
Common conditions
No prize can be exchanged for cash, swapped or transferred to third parties.
Prizes are delivered in Portugal or Spain, to the address given by the winner, with shipping at our expense.
In the event of stock shortage or force majeure, we reserve the right to replace any prize with another of equal or greater retail value, informing the winner accordingly.
7. How winners are determined
The weekly draws take place on the dates set out in section 5, among all participants who correctly solved that week's case within the deadline.
The final draw takes place on 12 October 2026, among all participants who correctly solved all four cases. Three winners and three reserves are drawn in succession, in order of drawing.
All draws are made using a random number generator applied to the list of eligible participants, in the presence of at least two representatives of Huxia, Lda., with an internal record kept of each draw.
Winning a weekly prize does not affect participation in the final draw. No one may, however, receive more than one final prize.
8. Notification and delivery of prizes
We contact winners by email, at the address used to register, within a maximum of 5 working days after the draw.
The winner has 10 days from that email to confirm acceptance of the prize and, in the case of the final prize, to give the delivery address. Failure to reply within this period counts as a waiver and the prize passes to the next reserve. Once the reserves are exhausted, we may hold a new draw or not award the prize.
The final prize is dispatched within a maximum of 30 days after the address is confirmed. Weekly coupons are sent by email at the time of notification.
We may ask the winner for identification, solely to confirm age and identity, without keeping a copy.
Publishing the first name and surname initial of winners on our channels depends on each winner's prior consent and is not a condition for receiving the prize.
9. Exclusions
We may exclude at any time anyone who uses multiple identities or email addresses, uses automated means to submit answers, manipulates or attempts to manipulate the Challenge systems, or otherwise breaches these terms.
Exclusion entails loss of entitlement to any prize, even one already awarded but not yet delivered.
Publicly sharing solutions before the relevant deadline closes is discouraged and may lead to the exclusion of whoever does so.
10. Personal data
The controller of the data collected in connection with the Challenge is Huxia, Lda.
We process the name and email address given at registration, the record of answers submitted and, for final prize winners, the full name and delivery address.
This data is used to run the Challenge, hold the draws and deliver the prizes, on the basis of performing the conditions accepted at registration, and to comply with legal obligations. Sending marketing communications depends on your consent, given separately.
We keep the data for up to 60 days after the prizes have been delivered, except data needed to comply with legal obligations and data of those who consented to receive marketing communications, kept until that consent is withdrawn.
The data may be disclosed to email delivery, hosting and shipping service providers, which process it solely on our behalf and according to our instructions.
You may at any time access, rectify, erase, restrict, object to the processing of, or request the portability of your data, or withdraw consent, by writing to wecare@zelthynutrition.com. You also have the right to lodge a complaint with the Comissão Nacional de Proteção de Dados in Portugal, or the Agencia Española de Protección de Datos in Spain. For more information see our Privacy Policy.
11. Changes and cancellation
We may amend these terms, as well as suspend, shorten, extend or cancel the Challenge, if circumstances of force majeure or technical, operational or legal reasons justify it.
Any change is published on this page, stating the date it takes effect, and communicated by email to registered participants, and may not prejudice rights already acquired.
12. Liability
We are not liable for entries that fail to reach our systems for reasons not attributable to us, such as network failures, spam filters or incorrect email addresses given by the participant, nor for delays or losses in transit attributable to the logistics operator, without prejudice to the rights available to the winner under general law.
Nothing in these terms excludes or limits our liability where the law does not permit it.
13. Tax treatment
Prizes are subject to the tax treatment legally applicable to them. Any tax charges falling to us under the law are borne by us in full, and no consideration of any kind is asked of the winner in order to receive the prize.
14. Complaints and dispute resolution
Any complaint relating to the Challenge should be sent to wecare@zelthynutrition.com within 15 days of the event giving rise to it. We reply within a maximum of 5 working days.
You may also submit a complaint, free of charge, in the Portuguese electronic Complaints Book at www.livroreclamacoes.pt.
In the event of a consumer dispute, see our Dispute Resolution page, where we set out the alternative resolution channels available to you.
15. Governing law
These terms are governed by Portuguese law. For consumer disputes, the court of the consumer's domicile has jurisdiction.
Any matters not covered by these terms are decided by us, according to criteria of good faith and equal treatment of participants.
Contact
Huxia, Lda. Rua dos Ferradores 39 B e C, Zona Industrial de Vilamoura 8125-498 Quarteira, Portugal wecare@zelthynutrition.com · +351 289 380 558 (cost of a call to a Portuguese landline)