The objective is to "Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9."
There are four puzzles there on the page from easy to normal to hard to very hard. The answers are also available. It's honestly been a fun little thing to sit and work at, me and Jamie have been attempting these overnight.
Jamie's best friend and aunt are set to fly over here in the near future. This is an interesting prospect, as they've told me they both want to bring stuff that can remain here, so they can bring extra back. If I can think of cheap things to whinge off them and pay them back when they get here, I may be able to get some clunky American goods quite cheaply, without the fear of extensive P&P charges.
Now, I've sat at this PC all night being boring and Jamie's obviously wanting to use the PC, so I'm going off to play Pikmin 2 now, and let her check her journal.