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Have You Got It?

Can you explain the strategy for winning this game with any target?

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Start with any number of counters in any number of piles. 2 players take it in turns to remove any number of counters from a single pile. The loser is the player who takes the last counter.

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A new card game for two players.

Wallpaper Sudoku

Stage: 3 and 4 Challenge Level: Challenge Level:1
Produced by Henry Kwok
Wallpaper Sudoku

Rules of "Wallpaper Sudoku"

The puzzle forms repeating patterns of numbers. Hence it is called "Wallpaper Sudoku".
  • All the numbers in the top right box are exactly the same in values and positions as those in the centre box and bottom left box.
  • The numbers in the top middle box match to those in the middle left box and bottom right box in values and positions.
  • Finally, the numbers in the top left box match in values and positions those in the middle right box and bottom middle box.

The remaining rules are as in a "standard" Sudoku, and the object of the puzzle is to fill in the whole 9x9 grid with numbers 1 through 9 so that each horizontal line, each vertical line, and each of the nine 3x3 squares must contain all the nine different numbers 1 through 9.

Due to the additional rule of repeating patterns, this puzzle needs only 9 starters.