It's one of those games highly worth checking out before the Nintendo DS draws its final curtains.
Main plot begins where a dead body is found at a junk yard named Sissel who has been murdered, but your spirit still lives on and has no memories from what happened before he got killed. Sissel learns that he possesses the ability to perform Ghost Tricks, in which he can possess inanimate objects, and can travel to four minutes before a person's death and alter their fate. As you progress through the story you learn more and learn more about Sissel's death.
Gameplay: After getting Sissel's special abilities called Ghost Tricks, you can move your spirit to other objects where you can manipulate objects to move and haunt people. By using the touch screen you can move from object to object, certain puzzles will require you to think and try and create your own contraptions in order to change the events before that person dies from death during the 4 minutes.
You can also talk to people who have died from the event and you'll rewind back in time from 4 minutes and see how they died, this is where you can change their fate from happening. It'll take a few attempts to crack a few of the puzzles and of timing can be another key for Ghost Trick waiting for the right moment to make something happen.
Telephones are used a lot to go back and forth through various telephone lines and where you need to go next as you progress through each of the chapters.
Graphics and Sound: What you'll really like about Ghost Trick is the story, but however is there a lot of text-dialog and you just want to get to the gameplay. But it can easily be ignored by the stunning artwork for most of its characters during cutscenes and text-dialog, what you'll really like is the 2D sprites with smooth animation making it feel like a really good Anime.
There are times where certain points of the story make no sense or certain characters act crazy or act in that behaviour, but you can totally tell that this game was made in Japan to begin with. However since it's a 2D game there isn't else much to complain on its gameplay or any issues on its frame-rate or camera issues. But I would admit that its gameplay gets really more interesting later on throughout the main story.
Lots of sound effects but no voice acting which probably makes it a good thing it seems to be already a good point and click game. Another thing you'll like about the game is the superb soundtrack which is worth listening to.
Overall: Its one of the last big DS games to be released for this year before most games making a jump to the 3DS. Is it worth picking up for the DS? It sure is quite a few places you can easily pick up Ghost Trick for around £5/$5.
Finishing the main story can last you around 10 hours or more pending on how much you want to get out of a story that involves around murder cases and finding lost memories. If you like puzzlers and wanting something new for a change Ghost Trick is highly worth checking out.