99% Sure this is turning Complete (the fibonacci program is not intended as proof) Created for: https://scratch.mit.edu/discuss/topic/195968/ Uses Subtract and branch if Equal To Zero Space runs 1 instruction. P starts repeating, S stops. f:Load Fibonacci program (output is at the end of mem) SUBZ is subtract and branch if equal to 0. Runs A <- B - C, jump to D if A<0. Uses 4 list items. No IO, but you can use the last item in the list. (I count either repeatedly clicking space or manually clicking forever as a way to start the project and still have it be usable.) (other controls and the custom block are for convenience and don't count).