when it aim to object (ex: Player) i want to appear the game over screen what i do
Hard to say — Maybe provide a capx example to better explain what you want
But from what I can gather, you want to use the Is Between Angles, or Is Within Angles conditions. Then go to the Game Over Layout
Or simply try using Turret Behavior https://www.scirra.com/manual/152/turret, it's pretty cool
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I don't get what you're trying to do... Could elaborate on that?
Cheers!