It's a very basic arithmetic game for children 5-6 years old.
The game is training child skills in counting, adding and substructing
articles and numbers. All wrong answers are logged in protocol file
that can be observed by grown-up for additional practice.
If your child is not so skilled in 'big' numbers you can change
maximal number using scale control. Note: Game can be played in two modes - "Freestyle" or "Direct".
Linux or other Unix: PerlTk 800, unix station/terminal with graphic display.