King and Balloon/Walkthrough

Start of the round
Each round begins with a formation of exactly 42 balloons: eleven red ones, eleven orange ones, eleven yellow ones and nine white ones. In order to proceed to the next round, you have to destroy every one of them with your cannon - which can be hit and destroyed any number of times, but will always come back to life. Try to use this to your advantage as much as possible, especially in the later rounds where more balloons will break away from the formation to attack you at one time.

When balloons attack
After a short while, the balloons will start to break away from the formation and descend upon your cannon. It is necessary to eliminate them with your fire, because if one manages to land under the castle battlements where the King is walking mindlessly around, it will pick him up and try to carry him away. If it succeeds, it will cost him a life when he reappears - and because he only gets one extra life in the game (at 10000 points by default), you should try not to let this happen by any means.

Save the King
The only way you can stop the King from being carried away by the offending balloon is by shooting it down - and as the King floats back down to his usual position after you have done this, all the other balloons will stop attacking momentarily and give you a clear shot at the whole formation. Try to pick off as many of the remaining balloons as possible before they resume their assault on both your cannon and the King.

The danger of giant balloons
Once per round, three of the balloons (each one a different color) will meld together in order to create a giant balloon that takes three hits to destroy. Hitting it once makes it become a medium-sized balloon, and hitting it a second time reverts it back to being a normal balloon. However, if you haven't destroyed it by the time it lands under the castle battlements, it will split back up into its original form of three normal balloons (or two, if you've only hit it once). If you've hit it twice, the resulting normal balloon will just land under the battlements and pick up the King in the usual way.