An extra constraint means this Sudoku requires you to think in diagonals as well as horizontal and vertical lines and boxes of nine.
Four numbers on an intersection that need to be placed in the surrounding cells. That is all you need to know to solve this sudoku.
Two sudokus in one. Challenge yourself to make the necessary connections.
This is a game for two players. Can you find out how to be the first to get to 12 o'clock?
The challenge is to find the values of the variables if you are to solve this Sudoku.
Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.
Can you guess the colours of the 10 marbles in the bag? Can you develop an effective strategy for reaching 1000 points in the least number of rounds?
How high will a ball taking a million seconds to fall travel?
