The only key thing is your phone – the battery should be fully charged as the game will use a lot (maybe 50% or more, depending on the phone and how long you take!).
You’ll also need to use mobile data, which may be an extra cost to you depending on your phone contract – if in doubt, please check with your provider. Note that the game runs in a web browser and contains approx. 5 minutes of video.
You may wish to use headphones to hear the videos more clearly, but they are not necessary. All videos are captioned too in case you can't hear them properly.
As the game is all outdoors, you may need an umbrella!