Heres a possible logo.
I have it so that all you have to do is type IG and it does it for you. (Assuming you have "PRG2:MSWS.DEF" loaded in slot 1, you would need the updated version)
You could save a text file containing how far they got.
Ex:
@DEAD
SAVE "TXT:PROG","***"
END
---------------
@START
PROG=VAL(LOAD "TXT:PROG",0)
IF PROG==0 THEN @INTRO
IF PROG==1 THEN @BEGIN
IF PROG==2 THEN @SLVL
ETC...