Puzzle 17
Place letters into the grid such that every row, column, and 2 x 2 block has letters (in any order) that form a common word. Each letter is only used once, and no letter is repeated in the rows / cols / blocks.
Letters allowed: S H O W E R S
| A | T | F | |
| A | |||
| G | N | U | |
| D | E |
Note: this puzzle is not interactive, and the squares cannot be clicked.
Puzzle Copyright © Alan Stillson and Frank Longo
Puzzle 18
Moving from letter to letter using the moves of a chess knight, can you find the letters 'PUZZLES' in order?
| Z | E | Z | S | Z | P | S |
| U | P | S | P | L | P | Z |
| S | U | L | U | U | E | U |
| E | E | P | U | S | U | P |
| P | Z | L | L | U | P | Z |
| Z | U | Z | S | U | L | P |
| E | P | Z | Z | E | L | U |
Note: this puzzle is not interactive, and the squares cannot be clicked.
The moves of a knight are:

Puzzle 19
What comes next in this sequence:
2 · 3 · 5 · 7 · 11 · 31 · 71 · 91 · ?
Puzzle 20
Can you find the country hidden in the following paragraph:
At school, most of my friends learnt French. I learnt Chinese, mainly because I planned to visit the area when I grew up.