Contact bound players during bound?

Would it be / is it possible to contact the participant through the app? e…g. broadcasting that the games is soon over? like a chat for alle players?

There is no possibility to chat with or reach the players during the game.
But you can use „Switches“ to announce for example the time used during the game.
Find out more here:

Erstelle eigene Erlebnis-Rallyes mit Actionbound