The maker of CandySwipe recently wrote an open letter to the makers of Candy Crush:
Two years after I released CandySwipe, you released Candy Crush Saga on mobile; the app icon, candy pieces, and even the rewarding, "Sweet!" are nearly identical. So much so, that I have hundreds of instances of actual confusion from users who think CandySwipe is Candy Crush Saga, or that CandySwipe is a Candy Crush Saga knockoff. So when you attempted to register your trademark in 2012, I opposed it for "likelihood of confusion" (which is within my legal right) given I filed for my registered trademark back in 2010 (two years before Candy Crush Saga existed). Now, after quietly battling this trademark opposition for a year, I have learned that you now want to cancel my CandySwipe trademark so that I don't have the right to use my own game's name. You are able to do this because only within the last month you purchased the rights to a game named Candy Crusher (which is nothing like CandySwipe or even Candy Crush Saga). Good for you, you win.