Thank you AllanR!!! That's exactly what i looking for. The solution is to use a sprite like a mask.
Thanks, but it doesn't works. The blend mode affect the whole sprite, and i need that a part of the sprite is visible and a part is invisible.
I am making a "find the difference"game. And my problem is when I resize an image some part of this Sprite should be invisible (because is overlapping another image)
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Sorry i'm try it in English. I have found how to do it.....using sub-events
Thanks to all of you
Tengo desarrollado el juego con los distintos marcadores de las diferencias. El problema es como conseguir que al pulsar un botón de pista, muestre una de las diferencias que todavía no se haya encontrado