I created an exact copy of my app game (famous person puzzle) with also same exact code blocks, but somehow my new app game got runtime error even though I created it with exact same code blocks as the original one.
=> Original one.
That's the weird part. My original game doesn't have runtime error like that. I tried to create 2 more exact copies to make sure I didn't miss any code blocks based on the original game, all of it got the same runtime error ..
I can't tell you why your original version worked, but you should definitely change the default init value of your two global random_... variables to 1, not blank.