**Puzzle 1:** Which letter replaces the question mark?**Answer:**** **B

**Explanation: **Start at the top left and move down the left hand column, then move one place to the right and up the next column etc. in a snakes and ladders pattern. Letters are written in alternate spaces, in steps of 7 letters at a time.

**Puzzle 2:** Which letter replaces the question mark?**Answer:**** **R

**Explanation: **The sum of the numerical values of letters in opposite segments of the circle is always 22.

**Puzzle 3:** Which letter replaces the question mark?**Answer:**** **H

**Explanation: **Starting at the top and moving down, the sum of the numerical values of the letters in each oval follows the sequence 20, 22, 24 etc.

**Puzzle 4:** Which letter replaces the question mark?**Answer: **M

**Explanation: **Start with the top Left Square, and move clockwise around the others. The sum of the numerical values of the letters in each square equals 20 for the top left, 25 for the top right, 30 for the bottom right and 35 for the bottom left.

**Puzzle 5:** Which letter replaces the question mark?**Answer: **D

**Explanation:**** **Start on the bottom left and move up to the top, then to the right one space and down to the bottom. Letters follow the alphabetic sequence alternately in steps of 6, then 8. Starting on the bottom right and moving up to the top, then left one space and down to the bottom, letters in this half follow the same pattern.