Trademark isn't about people making clones of your game. In this case Trademark is about people confusing the title of your game with another game because they use the same name.
Trademarking "Candy Crush Saga" makes sense because that's the full name of the game and is not a common word or phrase.
Trademarking "Candy" is absurd. This means any game that has the world candy in it is suddenly subject to litigation by King. Candy is a common word, and I could have a game called Unicorn Candy Attack and clearly that's not going to cause confusion with Candy Crush Saga.
Trademarking "Candy Crush Saga" makes sense because that's the full name of the game and is not a common word or phrase.
Trademarking "Candy" is absurd. This means any game that has the world candy in it is suddenly subject to litigation by King. Candy is a common word, and I could have a game called Unicorn Candy Attack and clearly that's not going to cause confusion with Candy Crush Saga.