Simple turn system

I have two sprites with control events on two separate groups called Player1 and Player2. How to set a turn system for them?

I had set Global number Turn = 1 variable.

How to set a condition which switch controls from Player1 group to Player2 using this variable?

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You don't necessarily even need a global variable. Assuming one group starts out active and the other starts out inactive and you only have 2 player groups.

On Switch Player Trigger -

-> System: Set group "Player1Group" Toggle active

-> System: Set group "Player2Group" Toggle active