You may also like

Have You Got It?

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


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.


A new card game for two players.

Wallpaper Sudoku

Age 11 to 16
Challenge Level
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.