Platform attack

How can I make it so that when I press X and my character's punch

touches the rock it destroys it?

http://dl.dropbox.com/u/19845326/segunda%20presentacion/test.capx

*EDIT*

Also that the punch doesn't immediately dissappear at the moment I

release the X button.

And I wanted to add the Physics behavior to the rock but when I do it completely ignores the floor's solid attribute and keeps falling for eternity.

Hi! try this!Capx I see you'r using spanish words! I speak spanish too! if you need help in spanish send me a PM!