When the game begins, you will see that Gaston has infiltrated Beast's castle, and you must now stop him. You can do this through a number of ways. To slow him down, you will be able to pour water over him from on top the castle with the help of Lumiere and Cogsworth. Because this only stuns him, you will also need to know some other tricks on how to defeat and banish him from the castle once and for all.
As he swings around the castle, you will be able to drop a rose for Beast, press 2 to drop a book for Belle, and press 3 to drop an invention to save her father. If you fail to take any action against the beast, then you will find that Ms. Potts and Chop will automatically come to the rescue, but only three times. After that, it is up to you to make sure that Gaston does not continue to cause havoc in the castle.
By increasing your speed when striking down Gaston, you will automatically earn more points and get extra buckets of water. This will help you to stun Gaston so you can gain the upper hand and stop him for good. Remember that the faster you are, the more likely you will be to defeat him. It is important to press the corresponding numbers when Gaston is near the various characters that are in danger. If you have quick fingers, then you will find that defeating him and winning the game will be a breeze.