Install the MathFaster package. Math types and difficulty can be changed with the Prefs button.
Set preferences, then use the New button to start a new game. To choose an answer, tap on the answer or cannon. When the guy is standing over the cannon, tap again to launch. Launch before the ball reaches the seal again or you are out of time.
The game is over when the balloon pops. To get more time, move over to the balloon by tapping on it. When the guy is there, tap the balloon to push it up. If the balloon is too high, the guy can't reach to push it.
A wrong answer does not take away any points. A correct answer is worth more points on higher difficulties and faster game speeds.
Delete the MathFaster application. There are no other files.
Check out www.sealiecomputing.com/MathFaster to buy the full version with more arithmetic types.