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Challenge you brain!On-Core Sudoku: consists of a nine-by-nine grid with 9 inner squares. To solve Sudoku each inner square must have one of the numbers between 1 and 9. Each row and column must contain each number once. It features error checking, annotations (pencil marking), undo move(s) and more.On-Core Sudoku features:- Games are generated randomly so you will never play the same game twice.- The game has three difficulty levels: Easy, Medium and Hard plus a Custom option for custom games.- Each difficulty level has it's own timer so you can try to beat your best time at each level.- The game auto-saves so that you can return to it at any time.- Generate Symmetric or Non-Symmetric puzzles.- Error checking to show invalid entered numbers.- Annotate (pencil mark) a tile with one or more numbers.- Unlimited Undo or Redo moves.- Autofill option to automatically fill in all the possible annotations. - Option to enter custom games from sources such as newspapers, puzzle books, websites, etc.- Wirelessly send or receive custom games, via a local WiFi connection, to a friend or family member who also has Game Pack Volume 1 or On-Core Sudoku.- Sound effects can be turned on or off.- No internet connection is required because the games are on your iPhone or iPod Touch.NOTE: This game is also included in our "Game Pack Vol 1". If you like Sudoku and PictureFlip, you may want to purchase our Game Pack so all three games are in one program.
This review was originally posted on VersionTracker.com. On-Core Sudoku comes with simple and very readable graphics. It has a very useful unlimited undo and redo so you can quickly and easily fix mistakes or backtrack if a deduction does not work out. There is automatic error checking, but this cannot be turned off.
On-Core Sudoku has auto fill to automatically fill in annotations at the beginning of a game. Auto fill does not automatically remove notation candidates as the game progresses, something that will please purists who prefer manual removal. Do not use auto fill after the game has started as it will automatically replace candidates you have removed by deduction.
The game generator creates games at three levels of difficulty, but unfortunately the generated games are not symmetrical. Games at the hardest level are very challenging and a quick check indicated that all games are valid and have only one solution. There is a useful option to view the solution if you get really stuck and you can easily return the game to its current state.
The option to enter custom games from sources such as newspapers, puzzle books, websites, etc is extremely useful. Now you can easily enter a game from your favorite daily newspaper and solve the puzzle on your iPhone. You can also save multiple games to your custom games list allowing you to enter a weeks worth of games in one session. This option alone makes On-Core Sudoku a worthwhile purchase.
On-Core Sudoku uses a large pop-up for number and notation entry, the pop-up obscures approximately half of the puzzle, making it impossible to check the puzzle when entering numbers. Further more, editing notations is particularly clumsy, it requires four commands just to edit one notation and editing notations in multiple squares can only be achieved by closing and reopening the pop-up for every square. The pop-up is not draqgable so it can't be moved out of the way. Because the pop-ups location is fixed it always obscures the same portion of the puzzle and you are making at least half of your entries blind. To make matters worse the squares that you are editing are only fleetingly highlighted making it doubly easy to make mistakes. Without this very poor implementation of number and notation editing I would have given On-Core Sudoku at least 4 stars.
If On-Core remove the horrible pop-up, streamline notation editing, allow automatic error checking to be turned off as an option, add continuous auto fill as an option, fix the game generator so that it only creates symmetrical games, then On-Core Sudoku would be a 5 star game. It would be the best Sudoku game for your iPhone and it would be a bargain at twice the price. It will be interesting to see the next revision.