1. At least one smartphone with working speakers (four phones can be used simultaneously)

2. WhatsApp installed on each phone used

3. An internet connection

We think so! If you're familiar with WhatsApp there'll be nothing here that feels complicated. It's as as simple as listening to the voice messages and inputting the correct answers.

There's no real limit, but everyone should be able to hear the voice clips. Four phones can be used simultaneously for the same Scavenger Hunt experience, which should cover up to twenty people.

Up to four phones can login to the scavenger hunt using the same link or access code. They will then move through the scavenger in sync — if one phone inputs the correct answer to a clue, all four phones will then receive the next message from Charlie Kneebone.

We have not noticed any mobile internet blackspots on the route. In the event that you have an issue, it should be easy enough to find some signal and then return to the hunt.