Here are some ready made resources collected from around the web. You could use them as a starter or a plenary or even as a homework activity.
You’re on an island with a lettuce, a rabbit and a fox… try these logic puzzles from mathsisfun.com Brain teasers are a great way to get kids (and adults) talking about problem solving.
This ready to print decoding activity involves deciphering a code made up of dots.
These printable puzzles are the type you might find in a puzzle magazine, cross out the boxes in the grid to work out the answers to the clues.
If you need any more there are lots of ideas on pinterest.