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Mystery Box
“Mystery Box” is a Mobileslots promotion in the UK, last seen on 27 September 2026. Opt-in and a minimum £20 deposit with a promo code are required, with one claim per day from Monday to Thursday. Players can randomly receive 25–100 Free Spins, whose winnings have 10x wagering within 7 days.
Offer at a glance
| Offer type | Mystery box |
|---|---|
| You get | 25-100 Free Spins “Players can win randomly 25-100 Free Spins.” |
| To qualify | Deposit £20 “Deposit with promo code offer.” |
| Then | Enter code “Deposit with promo code offer.” |
| Opt-in | Required “Opt-in Required.” |
| Wagering | 10× the winnings, within 7 days after crediting “10x wager any winnings from the free spins within 7 days.” |
| Expires | 7 days after crediting “free spins are valid for 7 days from receipt.” |
| Maximum converted to cash | £20 “Max conversion: £20.” |
| Payment methods excluded | Skrill; Neteller “Excluded Skrill and Neteller deposits.” |
| Mystery box validity | 24 hours “Mystery Box is valid for 24 hours” |
| Real balance wagered first | Yes “Wager from real balance first.” |
| Game contribution varies | Yes “Contribution varies per game.” |
| Selected games only | Yes “Available on selected games only.” |
| Wager calculated on bonus bets only | Yes “Wager calculated on bonus bets only.” |
| Withdrawal voids bonus | Yes “Withdrawal requests void all active/pending bonuses.” |
Opt-in Required. Deposit with promo code offer. Offer can be claimed once per day between Monday-Thursday. Players can win randomly 25-100 Free Spins. Min Deposit £20 required. Wager from real balance first. 10x wager any winnings from the free spins within 7 days. Contribution varies per game. Available on selected games only. Wager calculated on bonus bets only. Mystery Box is valid for 24 hours and free spins are valid for 7 days from receipt. Max conversion: £20. Withdrawal requests void all active/pending bonuses. Excluded Skrill and Neteller deposits. 18+ · T&Cs apply.
Public offer as published by Mobileslots. Affiliate-exclusive offers may differ. Every value above is quoted from that page.
What is good and what is not
In its favour
- Wagering 10× — low for the market
- No promo code needed
Worth knowing
- Winnings capped at £20
- Opt-in required
- Excludes Skrill, Neteller
Both lists are built from the operator’s own wording, shown in full further down this page. Nothing here is an opinion about the operator.
How this compares with other free spins offers
Same kind of offer, same section, other operators — by the numbers each operator publishes. The rating is worked out the same way for every row (method).
| Operator | Promotion | Min. deposit | Wagering | Rating | Go |
|---|---|---|---|---|---|
 Mobileslots | This offer | £20 | 10× | 4.2 | — |
 Winkslots | Mondays Reel Deal | £20 | 10× | 6.6 | Get offer |
 777 | Ready to spin the Daily Wish Wheel every day? | £10 | None | 6.5 | Get offer |
 Luckymate | Up to 200 Bonus Spins weekly | None | None | 6.5 | Get offer |
 Betfred | 100,000 Free Spins Leaderboard | None | None | 6.5 | Get offer |
| Betfred | Free Spins Acca | None | None | 6.4 | Get offer |
What the page does not say
- Promo code value not stated.
- Free Spin value not stated.
- Eligible games not named.
- Game contribution rates not stated.
- Full terms URL not present.
Details
| Operator | Mobileslots |
|---|---|
| Country | United Kingdom |
| Featured on promotions page | Yes |
| Runs | — |
| First seen | 26 September 2026 |
| Last seen | 27 September 2026 |
| Source | www.mobileslots.com |
Full offer and terms & conditions on www.mobileslots.com
What this offer works out to
Mobileslots runs this one without dating it. What it gives: Deposit £20 → 25-100 Free Spins. The way in costs £20. Winnings carry 10× wagering — £100 staked for every £10 of bonus. Our formula puts it at 4.2 out of ten.
Questions about this offer
Do I need a promo code for the Mobileslots offer?
No. Mobileslots does not publish a code for this promotion — the conditions above are the whole of it. Any “exclusive code” offered elsewhere is not from the operator’s page.
How much do I have to pay in?
The page states a minimum deposit of £20. Paying in less does not trigger the offer, and paying in more does not increase it unless the terms say so.
Can I withdraw the winnings straight away?
Not immediately. The reward carries a 10× wagering requirement, which means staking it 10 times over before the balance becomes withdrawable.
When does it end?
The page gives no end date. It runs until the operator withdraws it, and this site records the day that happens.
Is this offer available to existing customers?
The terms do not restrict it to new accounts, so existing customers should be eligible — but opt-in rules still apply.
History
This promotion was first listed on 26 September 2026; the operator’s page was last checked on 27 September 2026. The wording of the offer last changed on 27 September 2026.
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