Exactly what the name says: Click and drag numbers to arrange them into groups.
In "Arrange Numbers" your task is exactly that - to click and drag numbers into groups of the same. It's analogous to a Space Invaders clone actually being called "Shoot the Aliens" it's exactly that type of game.
So the idea is you're facing a set of random numbers. There are also borders around them. The borders stick and the columns/rows of numbers can be moved. It's your task to arrange - lets say, a bunch of 5's into joining blocks of, let's say blue. You don't have to get five five's, but you can't have any non-fives in the colour group.
It's not as fast-paced as it could have been, but the fact that most of it's in English and it comes from Japan makes up for this misgiving. The only thing I can criticize is the yellow and green outlines look very similar - although this most likely won't be an issue for most players.
It's short and fun, and is definately a little puzzler with heart. For a more arcade style experience, we recommend Kaboodle.