Go! Sudoku

'Go! Sudoku' is a sudoku puzzle game for the PlayStation Portable, released in Europe on December 2, 2005, in Australia on December 8, 2005, and in North America on March 21, 2006. It was later released in Japan on April 27, 2006 under the name of Kazuo (カズオ), as Nikoli holds the trademark for Sudoku.

Features
The base game features 1000 Sudoku puzzles grouped by difficulty, as well as various modes, customizable grids and multiplayer. 200 more puzzles are available for download from the ''Go! Sudoku'' official website, and players can add their own custom backgrounds to the games.

Bugs
There is a major glitch in the PSP version, in which a mysterious message dialog pops up at semi-regular intervals throughout the game if the console is not plugged in or fully charged. The dialog box covers the entire playing board, interrupting gameplay. There is no way to close the dialog box, though it will vanish on its own usually after about 15 seconds. The bug is even more obtrusive during multiplayer competitive play as it conveys a significant advantage to the player who does not encounter the bug.

PlayStation 3 edition
''Go! Sudoku'' was also released in 2006-2007 on the PlayStation Network (for the PlayStation 3) as an initial Starter Pack with 12 puzzles, with a level pack of more than 1200 puzzles.

Reception
The game received "mixed" reviews on both platforms according to the review aggregation website Metacritic.