Few puzzles have seized the nation's consciousness as completely as the Japanese number game Sudoku. So it's a no-brainer for software companies to throw a package together, put it on the shelves and watch the profits roll in.
This version, from Focus Multimedia, demonstrates the impunity with which the nation's latest addiction can be exploited. It's far from slick and has some rather annoying drawbacks. But anyone from the vast ranks of poor dupes already enslaved by the number grid will play it anyway. And love it.
If you don't already know (save yourself, stop reading now), Sudoku puzzles feature a nine-by-nine grid of squares, split into nine smaller grids of nine. You have to use the numbers one to nine once - and only once - in each row, each column and each smaller grid.
Puzzles come with some numbers already placed, from which you must deduce where the rest go, making each problem anything from easy to migraine-inducing.
Infinite Sudoku is a puzzle generator, so you can play it forever if you want. There are three levels of difficulty, which are fairly well-pitched - in this humble amateur's opinion - with target times to work against.
It also includes a few other features, such as a solver that allows you to input the numbers from other puzzles (also known as cheating), a display errors feature (ditto) and an undo feature - this sounds simple, but it's heaven-sent.
However, you can't save half-completed puzzles, which if you're a bit of a dullard - mentioning no names - can make taking a brief lie-down in the middle a bit difficult. Also, you can turn all possible pencil marks (jottings of possible numbers in each square) on or off, but you can't add your own.