Blindfold Sudoku is a fully accessible Sudoku game for both sighted and visually impaired people, designed for rapid audio play. You must solve the puzzle by listening and imagining the puzzle layout in your mind.
You control this game using iPhone gestures. Tap the button on the main screen to select a game: easy, medium or hard. In the puzzle screen, tap anywhere on the screen, and it will tell you the coordinates and the contents of the cell, and sets the cursor at that cell. Similar to voice-over, you can also slide your finger across the screen to hear each cell. Or, flick left to move left one square, flick right to move right one square, flick up to move up one square, or flick down to move down one square.
The coordinates of a cell are always spoken in a man’s voice; the contents of the cell – the numbers from one to nine – are always spoken in a woman’s voice. If a cell is empty, you will hear a beep. If you have put multiple candidates into a cell, you will hear a tone at the same time as you hear the woman’s voice. You will also hear the tone by itself after the last candidate for the cell was spoken. If you forget where the cursor is, just shake the phone.
To hear the entire row where that cell sits, swipe left with 2 fingers. To hear the entire column where that cell sits, swipe down with 2 fingers. To hear the entire box where that cell sits, swipe up with 2 fingers. If a cell is empty, you will hear a beep. If any of the cells contain candidates, you will hear a fast double beep; you will not hear the candidates. If the row, column or box has duplicates, you will hear a warning tone at the end. Otherwise, you will hear a ding at the end.
The original values for a puzzle include a tone – you cannot change these cells, and if you select that cell, you will hear a honk sound.
To change the value of a cell, tap the screen with 2 fingers. A keypad with the digits from 1 to 9, and other buttons will appear.
The keypad first tells you what is in that cell. To change it, tap a number; the cell changes and you go back to the puzzle.
To specify multiple candidates for a cell, tap the screen with 3 fingers. A keypad will appear – tap each of the candidates, then tap done.
To remove a number from the group of candidates, tap that number again. To set a single candidate as the answer, tap the SET button.
To restart this puzzle, tap the RESTART button in the keypad. You will be asked if you really want to restart the puzzle.
To clear an entire row in the puzzle, tap the CLEAR ROW button in the keypad.
To go back to the main screen, swipe up with three fingers. To pick a game you haven’t started yet, tap one of the NEW GAME buttons. If you start a new game, your current game will not be saved. If you restart the app, or you go to SETTINGS and want to get back to your current game, tap the RESUME button.
In the puzzle screen, to move to the next game with the same difficulty, swipe left with three fingers. To move backwards, swipe right with three fingers.