I want to make a bomb cut out a piece of wall.
Please look at the picture. I hopu u know what I mean.
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If you want to make a "fake" hole (only change the image), you can use blend modes. In Construct 2 select File-New and search for Blend Modes example.
If you need to change collision mask of the wall, you will have to do this with tiled background, see this post:
Thank you very much for these suggestions.
I will try both out.