Bubble Attack On Planet Earth

BAOPE - Bubble Attack On Planet Earth
The Story
Once upon a time in the future.
King Bubbles traveled the space to look for a new planet for him and his wife. The planet they lived on was not much fun, it was dark and mostly rocks, lava and more rocks.
One day the King passed a new planet and was amazed by the blue and the green colours he saw. He knew that Queen Bubbles would love it. The King was determined to travel to the planet to look for a suitable place for their future kingdom.
The King flew closer and closer to the planet, but then suddenly the Kings spaceship smashed into a defence shield surrounding the planet. The king was choked and flew back to his own planet again. He was determined to live on this newly discovered planet, it looked so much more nice than his current home planet.
King Bubbles was very good at mathematics, technology and science and had invented a way to turn bubbles into explosive plasma meteorites. These meteorites could crush the planets defence shield.
King Bubbles was ready to take on the shield.
But he was meet by the sharpest brains that was ready to protect their planet . . . Earth!

Gameplay
First, choose the difficulty level you want to play at.
You can be Alpha, Kappa or Sigma pilot.
Alpha is the easiest level and aimed at children from around 8-9 years old.
Kappa is intermediate level and can be played by older children and adults.
Sigma is the hardest level for older children and adults who are mathematically skilled.
You must defend the earth defence shield from King Bubbles plasma meteorites. Use your math skills to shoot and blow up the bubbles holding the answers to the math puzzles. If you do not answer correct or don’t answer before the bubbles get to the top of the screen they will turn in to aggressive plasma meteorites. You can blow up these meteorites with your bombs.
You earn bombs when answering 5-in-a-row correct. Every 4th Mission are grand test missions. You will need bombs to complete these missions. You have to use the bombs strategically smart or else you will get in trouble.
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About
This game is developed with a primary goal of getting kids/young people interested in using/exercising their math skills during play. But it is developed in a way that makes it fun and challenge to play for adults as well.