Feel free to look inside and use the "previous costume" block. How to do it: Name one of your sprite's costumes "previous costume". now you will have a block that says: "switch costume to: previous costume". Keep this block. Change your sprite's costume name back to normal and use your block. It will work! (Suggestion by: @scratchjack1234) (Grammar corrected by: @redstonelasher2010)
Thanks to barkpuppy5 for the original project, "Previous costume block". Added flashing text and made it more in-line with 3.0.
