We have 4 level, and infinities on each,
for each level,on each time you reach 100 score, the range number will be expand,
for example : the first time the number random in [-10, 10], after 100 score, the range expand to [-20, 20]...
The concept of the game is: you need to pressing corresponding number to kill the monster.
you have 10 “Heart”, if one monster collision on ground you loss one “heart”.
so, try to calculate quickly and type the result number to kill monsters as much as possible.

++Game Level++
Level 1 – Normal: just random the number in range
Level 2 – Nightmare: random number in range with statement include Operator plus: + and minus:-
Level 3 – Hell: random number in range with statement include Operator multiply: * and divide: /
Level 4 – Inferno: random number in range with statement include Operator +,-,*