Simple way of multiple identicle MC's?

I’m using this as my example again:

If you would play that game for a minute or two, what I’m wondering about is the X’s that damage you if you touch them. The only way I can think of having that many identical MC’s doing the same thing is to give each one of them a different instance name and have the actions apply to each one individually. Is there an easier way to do this? :puzzle: