Based on highly rated Logi5Puzz app, Logi5Puzz+ is an advanced version with more powerful features:

1. Grid sizes configurable from 3x3 to 16x16 on iPad, and from 3x3 to 9x9 on iPhone.
2. Absolutely advertisement free. No internet connection required to play.
3. Optional notes (pencil mark), hints and passcode lock.

Logi-5 Puzzle is a variation of Sudoku game. A 5x5 grid of squares is divided into 5 irregular (or pentomino) regions, each with 5 squares of the same color. The objective is to fill the grid so that each row, each column, and each region contains all of the 5 digits from 1 to 5. In other words, each digit should appear exactly once in each row, each column, and each region.

Logi5Puzz+ extends the grid sizes from 3x3 to 16x16, with or without regular option. A 9x9 regular choice with 3x3 square block for each region is the same as the common Sudoku game. A 4x4 regular grid has 2x2 square block for each region, a 6x6 regular grid has 2x3 rectangle block for each region, a 16x16 grid has 4x4 square block for each region, and so on. The shape of each region is random for irregular grids (or jigsaw sudoku) of all sizes. Grid sizes from 10x10 to 16x16 are enabled only on iPads whose screens are large enough for big sizes.

Logi5Puzz+ app randomly generates a huge number of possible puzzles without any predefined patterns for each grid size. The app presets a few numbers for each puzzle, and the player needs to finish the rest. The solution must be unique for each game. Because the app creates puzzles on the fly without using a big database to store pre-generated puzzles, it can combine so many sizes within one app, produces virtually unlimited numbers of puzzles, and maintain a very small download size at the same time.

Logi5Puzz+ provides good value:

1. Logi5Puzz+ plays common Sudoku games too, and a single purchase delivers Sudoku, Logi-5 puzzles, and much more choices.
2. It serves both beginners (with 3x3 grid size) and expert players (with 9x9 irregular or 10x10 to 16x16).
3. This is a universal app, and a single purchase works for iPad, iPod Touch, and iPhone (including iPhone 5) devices.
4. All features and unlimited puzzles included in the price. No in-app purchase to buy additional games, levels, or features.

The app can be an education tool for a beginner or young kid to learn Sudoku, by starting with 3x3 sizes, and then gradually increasing grid sizes. The irregular regions of puzzles introduces challenges not seen in regular Sudoku, and those who have been good at regular Sudoku can try 9x9 irregular (nonomino sudoku). Very advanced Sudoku players can play 10x10 up to 16x16 sizes.

The app can be configured to provide optional hints. A passcode can be set to lock the options on the maximum number of hints allowed, or whether restarting the game before finish is permitted. For example, a parent can lock the options with a passcode to ensure that a child honestly finishes a puzzle without any hint or restarting.

Tap a square and a list of digits plus a blank button will pop up for the player to choose a number to fill into that square. Select the blank button to clear the existing number in the square. When notes (pencil mark) are enabled by "Setup", selecting the notes button to edit tiny notation digits inside each empty square.

Tap the "New" button to start a new puzzle. Tap the "Check" button to check the correctness of the result. Tap the "Undo" button to reverse the previous actions. Tap "Redo" button to restore those actions reversed by "Undo". Tap "Setup" button to configure various settings. Tap "Share" button to email a friend with an App Store link to this app. Tap "Help" button to get instructions. Tap "Hint" button to get a hint, if you have used "Setup" button to allow a hint.