Rules of the Game Sudoku 42

Definitions

• The game board is 9×9, and the deck contains cards numbered 1 through 9 (81 cards in total).
• The board is divided by bold lines into 9 houses (3×3 squares) and by thin lines into rows and columns.
• A house, row, or column is considered closed if it contains all numbers from 1 to 9.

Objective

Collect nine cards in one house or row to earn victory points and gain the right to make the next move.

How to Play

Turn order

1. Move cards already placed on the board or select a new card.
2. Place a new card on the board.
3. Move previously placed cards, resolve any conflicts, then end your turn and receive a new card from the deck.

Selecting a card

• Clicking a card activates it (its background is highlighted).
• A newly drawn card is highlighted in red.
• An already placed card that is activated is highlighted in yellow.

Placing and moving cards

• With an activated card (highlighted), click on a cell to move the card there.
• If you click on a cell that already contains a card, the two cards swap places, and the previously placed card becomes active.
• When a house, row, or column is closed, the background of its cards turns gray, and those cards become immovable.

Conflict situations

1. Two cards with the same number cannot be placed in the same house. The game will not allow this.
2. Two cards with the same number cannot be placed in the same row or column. In this case, the numbers of the conflicting cards turn red.
   • You cannot end your turn or receive a new card until all conflicts are resolved.

Ending a turn

After placing a new card and resolving all conflicts, you can press Next to draw a new card.

• If you manage to close a house or a line during your turn, you earn bonus points and gain the right to another move.

Conflict resolution

• Select one of the conflicting cards and move it to another spot so that the Sudoku Rule is observed.
• You may resolve the conflict yourself, or press Solve and let the game do it for you.
  • Note: If the game resolves it for you, you will not receive victory points or an extra turn, even if you closed a house or line that move.

Algorithm for resolving conflicts

1. Solve problems as they arise.
2. Always resolve one problem at a time.
3. Always choose the simplest solution.

End of the game

• When the entire board is filled, a results window appears.
• If you chose the timed option and your time runs out, the game will notify you.
• If you wish to exit before finishing and start over, you can select End Game.