Destroyable tile(layer) and destroyable block?

[funkynut]

I remember doing that for a Game ages ago, but it was for grass clumps (Zelda like)

I lost the source agggges ago so cant rip it sorry. But I do think that I did it by copying the door/key tile but setting it to open when it was attacked rather then when stepping on a key open tile if that helps at all