With an outstanding story and intriguing gameplay, The World Ends with You is worth the 7 days.
The original story has so many twists and turns. The gamplay is very innovative. Sprites and backgrounds look beautiful.
The Bad:
The controls for both screens can be frustrating sometimes. Not much to do after completing the game.
I started playing this game since it was released and I first thought, 'This game is going to be boring.' But I have never been more wrong before. The game is a bit twitchy at the beginning but as you progress through the game, it gets more and more addictive. You play as a gopher called Neku who wakes up in the middle of Shibuya and has no idea how or why he is here. Soon he discovers that he is playing the Reaper's game for 7 days and if he fails then he'll no longer exist.
The gameplay takes place on both screens. The bottom screen has you fighting as Neku by using the stylus, much like The Legend of Zelda. The top screen has you fighting as his partner by using the control pad.
All in all I think The World Ends with you(formally known as It's a Wonderful World) is a worthwhile game.