How to count the number of people in a game:
Place a lifecycle. It should be set to game start by default. Place a relay. The relay audience should be set to all players by default. Place a counter. Connect the lifecycle to the relay and the relay to the counter (the counter’s setting should be “increment counter.”
How to decrease this amount when players die:
Place a knockout manager. It should be set to “players” by default. Connect it to the counter (the counter’s setting should be “decrement counter.”)
So this is how to track the number of people. However, using the overlay will require blocks and can get a bit complicated. Do you still want to do this?