play arithmetic.zetamac.com in the terminal
requires multiprocess
-a1 --a1_min minimum value for first addend
-a2 --a1_max maximum value for first addend
-a3 --a2_min minimum value for second addend
-a4 --a2_max maximum value for second addend
-m1 --m1_min minimum value for first factor
-m2 --m1_max maximum value for first factor
-m3 --m2_min minimum value for second factor
-m4 --m2_max maximum value for second factor
-o --operators some non-empty subset of '+-*/'
-t --time game duration in seconds
default is the same as zetamac