Get the number Property and name it āTimerā make it have a default value of 0 and when property value changed transmit on channel āchange valueā
The counter you have edit it to have a starting value of 120. Make it update property āTimerā and make it have a target value of 0. Make it decrement on ātimer startedā
Now get the lifecycle with and event of game start and in the channel section when event occurs āgame startā broadcast message on channel āgame startā
Step 2
Get the overly keep it as a text and keep it with these settings:
This to end game when timer ends
Go to the counter settings make when target value reached broadcast message on channel āend gameā
Now get and end game device that ends the game on channel āend gameā