HOW TO ENTER THE PRIZE PUZZLES

A fine Telegraph fountain pen and notebook will be awarded to the sender of the first correct solution opened from all entries received to each puzzle.

To enter by email:

Send your scanned solution and coupon, along with your postal address, to: prize.puzzles@ telegraph.co.uk with Sunday Toughie 3 or Sunday GK 1524 or EV 1526 or Griddler 1634 in the subject field.

To enter by post:

Send each entry in a separate envelope to: Sunday Toughie 3 or Sunday GK 1524 or EV 1526 or Griddler 1634,

Telegraph Media Group, 111 Buckingham Palace Road, London SW1W 0DT.

Closing date:

9am Wednesday, February

23. Solutions and winners in two weeks. Please allow up to six weeks for the delivery of your prize.