Puzzles will be created with Jigsawplanet - web2 tool and the students will do them. Very enjoyable activity.
Here are the links to the puzzles.
https://www.jigsawplanet.com/?rc=play&pid=01bc01dfd8c1
https://www.jigsawplanet.com/?rc=play&pid=2e9a72f8e075
https://www.jigsawplanet.com/?rc=play&pid=3e04b0c078ed
https://www.jigsawplanet.com/?rc=play&pid=21106a5f12e0