Thanks GameGod, now i know this function. Many thanks.
To put my contnet in my sepific, i like to show the value of varialbe during the program, so that i think the below block will be more useful then the debug mode, which is to fix the easy error before go to the larger error checking in debug mode.
it is located in the sprites group with the block called “sprites say…”.
with such help, i finally tracked down the bug, and make the correction accordingly.
Here is the linkage for the new version of code: https://makecode.com/_FTJbRRYEkfv4
Thanks a lots for building such a great platform for code learning.
Jack