Here's with pen:
Important: When you lose health, don't only change health by a number, also set that variable "moving-dir" to 0. When you gain health, set it to 1.whenclicked
clearset x to0set pen color torepeat1change x by100set pen color toforevergo to x:y:0+healthwhere you wantifmovingdir=1set pen color toelseset pen color to
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Take a look at this project which uses pen health bars - (Note that they don't flash even without turbo) - and check the scripts
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Could try this: http://scratch.mit.edu/projects/Prism/1290907
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