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i cant work out, how to prevent the charachter from jumping more than the amount of times i want them to.
any advice?

make a variable called "jump"
Put this code on keydown to jump

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if(jump==1)
{
    yvelocity-=15; //or any value you want
    jump=0;
}

Put this code on collision with platform

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jump=1;

ok, thanks.

to make a double jump put this code on keydown to jump

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if(jump>0)
{
    yvelocity-=15;
    jump--;
}

put this code on collision with platform

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jump=2; //2 for double jump, 3 for triple jump, etc...

Oh yah...make sure you have only ONE event on those keydown...
I mean, only one script editor event each...