Simple question - "Duplicate definition"

[dadsherm]

Since the player doesn't lose any "lives" if "0" or a negative number are used, you may want to consider changing your code:

CASE IS = 0
PRINT "You may not guess 0. Please guess again."
SLEEP
CLS
GOTO start

TO
CASE IS < 1
PRINT " This game is for the LIVING only!
PRINT "Please enter a number between 1 and 20"
SLEEP
CLS
GOTO START

This will eliminate the need for the "< 0" CASE.