playSudoku: Interactively play a game of Sudoku

Description

Interactively play a game of 9x9 Sudoku with hints and undo

Usage

playSudoku(z=NULL, hist.len=100, solve=TRUE,
              display=c("guess","windows","tk"),
              hscale=1.25, vscale=1.25, ...)

Arguments

Either a 9x9 numeric matrix representing the Sudoku grid (with '0' representing a blank cell), or 0 (zero) for an empty matrix, or a filename (passed to readSudoku), or NULL to generate a puzzle randomly.

hist.len

Integer representing the number of history steps to remember (number of undo's possible).

solve

Logical indicating if the solution should be computed (used for checking current answer or cheating).

display

Type of display. The default 'guess' uses a windows graphics device if getOption('device')=='windows', otherwise it uses tk (requiring the 'tkrplot' package).

hscale

Passed to tkrplot

vscale

Passed to tkrplot

...

Arguments passed to generateSudoku

Value

An invisible matrix with the solution or current state of the puzzle. Save this if you stop part way through, and use it as the input for the function to start again where you left off (undo info is lost so make sure that everything is correct).

Details

To play, move the mouse arrow over an empty cell and press the number key to enter the number in the cell. Typing '?' brings up a menu of additional commands:

    ?     -- a short help message
    1-9   -- insert digit
    0,' ' -- clear cell
    r     -- replot the puzzle
    q     -- quit
    h     -- hint/help
    c     -- correct wrong entries (show in red)
    u     -- undo last entry
    s     -- show number in cell
    a     -- show all (solve the puzzle)

Examples

Run this code

# NOT RUN {
puz1 <- playSudoku(0)        # Use as an editor to create a puzzle, then quit
sol1 <- playSudoku(puz1)     # now play the puzzle

puz2 <- edit(matrix(0,9,9))  # Or use this editor
sol2 <- playSudoku(puz2)     # now play the puzzle

playSudoku()                 # Play a randomly generated game

playSudoku(fetchSudokuUK())  # Play today's game
# }