What??? Pro Candy Crush Saga....
Yes lots and lots Stop you from copying a name and just adding an adjective to it.. it's called copyright law, and trademark law, and you will get sued or asked to stop (cease and desist) fairly quickly if you copy any of the bigger games.. and some of the smaller games
Change the name... It may be a ball ache but you don't want to risk somthing when you already know about it. It's pretty standard in situations that the first people to do somthing will win most cases. It's not worth the risk. Also is this other game any good or do you want your game tarnished by it's presense when people search for your game.
Well that's not what I meant. Of course he should NOT name it like a trademarked one. More often than not simple names are just taken. So if your game for instance has the name "Dice" you could just alter it a bit. That's what I meant. When the name is already taken that doesn't mean you may not use the same one.
Well better to be clear on this.. Even if somthings not trademarked they can still get you for copyright infringement, Which is granted to people upon creation of their work.. So even when changing the name it's always better to be cautious...
Some words are also considered common, it's like you can't trademark puzzle as a single word, but you might be able to trademark somthing with puzzle in the title..
Either way, If your already in doubt, or your name game is so close to another game (even a tiny little game no-one has heard of) then just play it safe and change the name...