Stack the viruses and if the tower goes to the top of the screen the patient will die and it will be game over.
simple variables, basic math, advanced motion, variables, simple conditionals, advanced math, advanced messaging, simple messaging, functions, actor properties, miscellaneous, advanced animation, level design, expert physics, detect conditions, resize actor, advanced costume handling, input/output, advanced physics, conditional wait, cloning, advanced loops, simple events, simple sound playing, expert math, direction and turning, string handling, simple motion, stage property, screen bounds, text handling, simple loops, conditional loops, pen color, basic physics, advanced control,