SlotSite.com Mystery Box: 25 to 100 Free Spins
The Mystery Box promotion at SlotSite.com is available from Monday to Thursday and gives players a random Free Spins reward after a qualifying deposit.
Each Mystery Box contains between 25 and 100 Free Spins. As the offer can be used once per day, players can potentially claim four boxes during the week.
Mystery Box requirements
To unlock a box, players need to:
- Log in between Monday and Thursday.
- Deposit at least £20 through the casino cashier.
- Apply promo code MBOX.
- Open the Mystery Box to reveal the Free Spins reward.
A new qualifying claim can be made on each promotional day.
What can you win?
The Free Spins amount is determined randomly according to the following probabilities:
| Mystery Box reward | Winning chance |
|---|---|
| 25 Free Spins | 36.5% |
| 35 Free Spins | 36.5% |
| 45 Free Spins | 10.43% |
| 55 Free Spins | 10.43% |
| 65 Free Spins | 5.21% |
| 100 Free Spins | 0.94% |
The maximum possible reward from a single box is 100 Free Spins.
Wagering and reward validity
The Mystery Box itself must be used within 24 hours of being received.
Any bonus funds or winnings generated from the Free Spins have a 10x wagering requirement. These funds expire 7 days after being credited if they are not used or the wagering requirement is not completed.
Once the wagering conditions have been met, up to £20 can be transferred to the real-money balance.
Terms and conditions of the promotion
- The offer runs from Monday at 00:00 GMT until Thursday at 23:59 GMT.
- A minimum deposit of £20 is required using promo code MBOX.
- Deposits must be completed through the casino cashier.
- One Mystery Box can be redeemed per day.
- Each box awards a random prize of between 25 and 100 Free Spins.
- Free Spins winnings and related bonus funds require 10x wagering.
- Wagering contribution rates may differ between games.
- The Mystery Box expires 24 hours after receipt.
- Bonus funds and associated winnings expire after 7 days.
- The maximum amount that can move to the real-money balance is £20.
- Deposits made through Skrill or Neteller do not qualify.
- Withdrawal requests may cancel active or pending promotional bonuses if their conditions are still outstanding.
- SlotSite.com may amend, suspend or cancel promotions that have not yet been awarded.
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