"Add-on" for Sudoku fans finished with Brain Age
There is a larger number of sudoku puzzles in Gridmaster, so that will keep you occupied for long trips. The only really thing that is an improvement over Brain Age is the inclusion of the number select option, versus writing it in. Sometimes writing it in isn't as fast as just pushing two places on the screen. This is especially helpful in that it is often hard to write in '5' because the Gridmaster software often confuses it with 9 or 3. While it's a simple game, there are a few needed improvements. Three music modes (with no "off" option) is way too small, plus they are really poor elevatior midi files. It was nice to be able to change the backgrounds, but some of that movement can be distracting at times. Also, when you selected a screen or a puzzle, the load time was slow - add to that the annoying "Start" at the beginning of the puzzle. There was also no real reward system save for the access to additional puzzles and the medal levels. Maybe future games can have unlockable music or backgrounds.
In all, it's a good add-on if you are a fan, or have the need for more addictive puzzles - Just don't get it at the full $20, get it on sell or used. Hopefully, there will be future Sudoku releases that ties in good features of both this game and Brain Age.