This computer game is based on BrainTeaser by Wim Nijland (1993 year).Choose digits from 1 to 9, split by reaction method into three groups (1-3-7-9, 2-4-6-8, and 5).The goal is to display all digits except 5, without letting the field be cleared.
The release coincided with the platform's 50th anniversary.
Source code — 
bt.zip
This is a great little program! Certainly going to be adding this to my APPLE-1 emulator's program library.
Thanks for sharing.
Cheers,
Landon
Brain Teaser for Apple I — https://sourceforge.net/projects/b-t/files/Apple-I/
Brain Teaser for Apple II — https://sourceforge.net/projects/b-t/files/Apple-II/
Brain Teaser for Apple III — https://sourceforge.net/projects/b-t/files/Apple-III/