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Puzzle 601
How many squares of any size on this chessboard do not contain a rook?
Puzzle 602
Starting with COLD, change one letter at a time until you have the word WARM.
Each change leaves the other letters in their original places and must result in a common word.
What is the minimum number of steps required to achieve this change?
Puzzle 603
Can you find a five-letter word which …
… when written in upper-case, reads the same when turned upside down?
Puzzle 604
Below is a very special grid, around each shaded number are 8 white squares.
However, each white square should have a number from 1 to 7.
Once filled in, these 8 numbers will sum to the shaded number.
In addition, once completed correctly, no row nor column will contain a duplicate number within a white square.
For example, the top row may be 5 6 4 2 3 1 7, etc.
This is a very difficult puzzle, and many people resort to using a computer to help them, which is a challenge in itself.
