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I have a sound effect for when Mario jumps, but the sound effect can be triggered whenever the jump buttun is pressed, even in the air. How do I make it so the jump sound only plays when mario actually jumps?

create a variable named "in_air"
on collision with ground:

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in_air=0;

on collision finish of ground:

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createtimer("Jump", 100);//make it only repeat one time

on timer "Jump" :

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in_air=1;

on keydown of your jumping key:

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if(in_air==1)
{
    playsound2("/data/Mario_jump.wav" 0, 0, 1);
}

Not sure if the playsound is correct

what do you mean by

on timer "Jump"

Go to TimerEvent>ScriptEditor

click Add=>Timer=>Jump=>Add=>Script