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The Challenge

The Challenge window gives you the opportunity to try to solve the puzzle yourself, with the program providing some assistance:

  • You can try any arrangement of digits you'd like.
  • The program will automatically enforce the rule requiring that each digit be used only once.
  • The program will do the arithmetic and show you which cells satisfy the rule requiring multiples, and which do not.

Color Codes

  • Green: The sum of the digits in the adjoining cells is a multiple.
  • Red: The sum of the digits in the adjoining cells is NOT a multiple.
  • Yellow: The cell, or one or more of its neighbors, is empty.

Entering Digits from the Keyboard

  • Select a cell by clicking with the mouse or by pressing the "Tab" key to cycle through the cells. The selected cell will be indicated by a gray border.
  • Type the digit. Only an available digit will be accepted. If the selected cell already contains a digit, it will be returned to the palette.

Entering Digits by Clicking

  • Select a cell as in the previous section.
  • Click an available digit in the palette. It's value will be assigned to the selected cell.

Dragging Digits

  • Drag a digit from the palette of available digits. The destination will be highlighted with a blue border.
  • Drag a digit from one cell to another. If both cells have values, they will trade places.
  • Drag a digit out of a cell, either back to the palette, or simply to the area surrounding the puzzle.