About Unknown Sender
Unknown Sender is a real-world, story-led mystery experience played on foot across UK cities. Players receive messages on their phone, follow clues through real streets and venues, and work together as a small team to uncover what happened.
Currently playing
- Game
- Last Call
- City
- Leeds city centre, United Kingdom
- Duration
- Approximately 90–120 minutes
- Format
- Outdoor walking experience, played through the Unknown Sender app on iOS and Android
- Team size
- Up to 6 players
- Age
- 18+
Tickets
Tickets are sold in pounds sterling (GBP) via Stripe. Three team sizes:
- Team of 1–2, £40
- Team of 3–4, £70
- Team of 5–6, £90
Each ticket is valid for 90 days from purchase and can be redeemed at any time within that window. See our Refund Policy for cancellations and transfers.
Contact & support
The quickest way to reach us during a game is by WhatsApp, you can send messages, voice notes or screenshots as you play. For anything less urgent, email is best.
- Email: hello@unknownsender.co.uk, we aim to respond within two working days
- WhatsApp: details in your booking confirmation
- Phone: 0330 880 6072, UK local-rate number, not staffed 24/7 (WhatsApp or email is quickest)
In a genuine emergency, always call 999.
Operator
Unknown Sender is operated by Treadwell21, a company registered in England and Wales, company number 16996311.
Registered address: 71–75 Shelton Street, Covent Garden, London, WC2H 9JQ, United Kingdom.