For any number of players.
This game is played at any time with friends who know the rules.
At any point and from any recognizable distance, if you make eye contact with someone who is playing and mime blowing through your hands as if a blowgun, you have darted them.
They must lay down wherever they are unable to move, but still can talk, until anyone walks up to them and pulls the invisible “dart” out of their neck. They’re free to verbally convince passers-by to do this, or the shooter can walk to them and do that.
The shooter is also allowed to “fishing line” the dart out of their victim’s neck from any distance by making a casting a fishing rod and reeling something in motion. This is just so the dart-er does not have to walk over to the dart-ed to help them.