If you’ve got an itch that a single, newspaper-bound Sudoku puzzle each day just can’t satisfy, then Go! Sudoku is your cure. That or a good, sturdy back-scratcher.
Go! Sudoku is a collection of approximately 1000 different Sudoku puzzles across an array of different difficulty levels, as a competitive or cooperative multiplayer game, or as a single-player time challenge. As a bonus, there are even more puzzles available for download, though the interface to get to them is pretty clunky.
Let’s be honest… it’s pretty hard to screw up Sudoku. And for the most part, Sumo Digital has done a good job. Despite the fact that the PSP is the least-likely candidate for a portable Sudoku game - the DS touch screen is way more Sudoku friendly - the interface here is pretty intuitive. You use the shoulder buttons to choose a number, then the d-pad and face buttons to place it. Place the number correctly and you move on; place it incorrectly and the game warns you of the mistake. Simple. You can even write several possible numbers in a tiny font in a given cell, a technique used by most puzzlers when solving pen-and-paper Sudoku, then go back and replace them with a single number when you figure out which one belongs there.
But there’s a hitch. Unless your PSP is plugged into an outlet or the battery is fully charged, there’s a strange "Warning: please wait..." screen that pops up at random intervals during the game and lasts for a good 15 seconds or more before vanishing. This sucks, because said warning screen covers up the entire puzzle when it appears, making it impossible for you to enter a digit or even concentrate on figuring out where the next number should be placed. It's annoying at best and infuriating at worst. How the hell did that get through quality-assurance testing?
This ridiculous glitch is a hindrance when you're playing alone, but becomes especially crippling in the competitive multiplayer mode, where the lowest accumulated time on each puzzle wins. Imagine being the unlucky soul who has to stare at this stupid warning screen, watching precious seconds tick away while you wait for the privilege to actually look at the puzzle again.
So the developers have crafted a very playable puzzle game with a decent multiplayer aspect and screwed it up with a tiny bit of bad programming. Go! Sudoku is nearly scuttled by this strange bug, which is a real shame.