What should players bring with them during the game?

Each player must bring the following items with him during the game:

A smartphone with a full battery and sufficient data. The app requires an internet connection to function properly. This way teams can chat with each other, see each other’s location and try to thwart each other.
We use the Loquiz app for the game. Install the app before the game starts.
Optionally a power bank to charge the smartphone during the game
Good walking boots

Not everyone actually needs a smartphone. One smartphone is required per team. However, it is useful if everyone has a smartphone, so that if one smartphone fails, the team can continue with another smartphone.