Portrait of Ruin is a great game but could have been better.

User Rating: 8.7 | Castlevania: Portrait of Ruin DS
It Sticks to the classic castlevania formula but adds another character to chose from. I find the game too short, personally. You can change characters at any time and also have both on screen . Jonathan can use lots of weapons and sub weapons and Charlotte can use spell-books and lots of spells. In the castle you will find paintings where you can enter and find monsters and bosses to defeat. The single player part is great, but wi fi playing could be better. You can play co-op mode or open your shop via wireless or wi fi, but only 3 courses are available to play.
PoR is better than Dawn of Sorrow, and it's highly addictive. but it isn't a perfect game.