Digit Breakthrough app for iPhone and iPad

Digit Breakthrough is the reincarnation of the early 80s Casio calculator game breakthrough. This game was game one on the Casio Calculator MG-888.This game was the sequel to the digit invaders calculator game which can be found on the Casio calculator MG-880. This is an Arcade game which involves timing, reaction and planning.

The objective of the game is to shoot the red left most number on the screen. When this number is shot it will decrease in value. When this number reaches 0 you have completed the level.
To shot you press a number on the key pad this will fire the number down the track, when this number hits the same number this is a successful shot if this number hits a different number this is a miss.
A successful shot on the red number leads to points being scored and the red number decreasing by one.
There are guard numbers which circle around the track and get in the way of the number the user shot reaching the red number, when these are successfully shot (with the same number) they disappear.
At certain intervals new guard numbers are created. The speed at which guard numbers move increases at higher levels

Each Level is unlocked only when the user successfully completes the previous level. When the game is first installed the first level is the only level unlocked.

At certain time intervals the red dot on the screen moves to the next square on the right, when this dot runs out of squares to go to the game ends. The speed of this dot increases at higher levels.
A missed shot at either the red number or a guard number will also cause the red dot to move one square to the right.

A successful shot on the red number will cause the dot to move back one square to the left.

You get points when the red number is successfully shot. The number of points you get is dependent on how many squares the dot has moved.
The score is (9 - red dot position) *10 where the red dot position goes from 1 (start square to 8 the last square on the right). I.e. if the dot is in the second position then a successful shot of the red number would result in 70 points being awarded.
You get a 100 point bonus for shooting a guard number and the red number with the same shot.