Sudoka 4+

To distract yourself or make your neurons work, in transport or at home, to simply play or to discover new solving techniques, access an unlimited number of sudoku grids.

The essential application for any Sudoku enthusiast, beginner or experienced, without advertising or in-app purchases.

Resources
• integrated grid generators for three levels of solving difficulty (press one of the three loading buttons, red, orange or green on the upper banner)
• grid level indicator (round patch of the upper band), whether provided by the app or entered on the keyboard, based on the following classification:
- 1) grids solved without indicating the candidates (generated by pressing a green button and identifiable by a green dot)
- 2) grids requiring the removal of candidates registered in the same area (generated by pressing an orange button and identifiable by a dot of the same color)
- 3) grids requiring, in order to remove candidates, to be based on candidates registered everywhere on this one (red dot and red button)
- 4) grids requiring to force candidates to progress (not generated by this application but identifiable by a black dot)
Tools
• possibility of filling in the candidates in the cells if necessary (press the "pen" icon, present at the bottom left of the screen, before entering the keyboard)
• using your finger as a marker to highlight an area or a cell
• possibility of ignoring the steps requiring the use of a technique considered to be known (press the “fast forward” button)
• automatic writing of candidates in cells if desired (press on the “cell(s)” icon in the upper banner)
• possible recovery of the contents of a cell if error (press the “back” button)
Training
• documented solutions available with color highlighting of grid areas or cells (press the text box at the bottom of the screen for a "step by step" explanation, or press the "advance" button, located at the bottom right, for the solution to the current step)
• backtracking possible on each step after viewing a solution or displaying help so that the step in question can be taken alone (press the “back” button at the bottom left of the screen)
• presentation of the nineteen common methods used to solve a sudoku with many examples available for each method (press the “teacher hat” button located in the upper banner then press the desired method in the displayed list)
Getting started
• quick training button to use the application (press the "?" icon in the upper banner)
• detailed information panel for all features (press the "i" button on the button bar)
Help
• drop-down message for help finding a solution and using the application if desired (press the “teacher” icon located at the bottom right of the screen)
• indications for progress, without providing a solution, if you feel blocked (press on the text box at the bottom of the screen)
• solution at each resolution step if desired
Ergonomics
• position of the buttons on the sides for iPad and at the bottom of the screen for iPhone
• full functionality on a single screen page
• opening the application directly on the grid
Comfort
• modification of the lighting if necessary, "dark mode" available (press on the "moon" or "sun" icon in the upper banner)
• activation or deactivation of sounds if desired (press the “speaker” icon in the upper banner)
Mobile use
• no network connection required
• automatic grid saving