Why is it that when I use the sensing block it sometimes won't work unless I move the script to the other sprite? If cat is touching mouse will not work, but if I change it to if mouse is touching cat it works.

You probably need to share a script where this is happening.

You can't sense if the mouse is touching something, though, with an individual block. There's no “mouse touching ()” block,

turkey3 wrote:

You can't sense if the mouse is touching something, though, with an individual block. There's no “mouse touching ()” block,

You have to put it in a IF or some control block to do anything with it. You do have to as if the mouse is touching you. Obviously two sprites can be asking that.

touching[mouse pointer v]