Creating and using player groups?

Goal: Unless I misunderstand, I should be able to assign every player to one variable and use it instead of 12 lines of Player 1 through to Player 12.

On 'Map Initialization' I assign my player group variable to 'All Players' using the 'Set Variable' action. This seems simple, but when trying to apply this to triggers I realize it's impossible to use. I am missing something very key, probably what player groups do. Whenever I try and make a trigger using my group, the only variables I am allowed to select are 'Player' variables, not 'Player Group' variables. And, 'Player' variables can not be defined as 'All Players'. Can someone give me a simple explanation on using a variable that specifies 'All Players'? This would be very helpful.

Thanks in advance. :>

Nope. You have to use all 12. The events are inheriently "OR", though, so if you put all 12 it works if any player does it.

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If you don't mean events, then, Pick all players in player group (all players) and do X.