To place a "minus" (known false), left-click any cell on the grid. On touchscreens, tap the cell.
To place a "plus" (known true), right-click any cell on the grid. On touchscreens, tap and hold the cell.
To clear a "minus" or "plus" cell, click or tap on the cell.
To color a "minus" or "plus" cell blue for emphasis, middle-click the cell.
To add data for statements/mutually exclusive clues, click "Edit affected cells," place a minus/plus in the cells that would be altered if the statement were true, and click "Stop editing."
Press the "Save" button to record all of your progress in the current URL. You can share this URL with others.
Cell color chart:
Black: manually specified
Gray: implied by other cells
Purple: implied by statements/mutually exclusive clues
Red: affected cell data for a statement/mutually exclusive clue that is being edited
Red (question mark): direct contradiction
Blue: marked by user for emphasis
Contact
If you have any questions, comments, complaints, or suggestions, you can contact me at: