The game involves rolling a small sticky ball around, picking up objects along the way. As you get bigger, you can pick up bigger and bigger things. You need to get your katamari to a certain size to finish the level.
There is a very Japanese like theme involving the King of the Cosmos (your father, you being the Prince...) and a strange anime family that you see in surreal snippets.
To be honest, I speed through all the translated story line since it makes no sense...
Once you get to the requested size, the King of the Cosmos congratulates you and urges you to get even bigger. The size relationships are accurate, so when you get to be three meters tall, you can pick up people and other large objects. Nothing more satisfying than picking up a pair of large sumo wrestlers.
I love it, the kids love it, even Michele loves the game...
In addition to the single player mode, there is a head to head mode where you can compete. The best is when you can grab your opponent and drag them around.
You should run, not walk, to the game store to pick up this game.