Puzzles are a great activity for kids.
They exercise the brain and develop logical reasoning. Picture sudoku gives a chance to introduce the idea from the very begining.
They can also be a base for a classroom discussion:
What clothes do you wear to stay warm in cold weather?
What winter sports can you think of?
Do penguins live in the North Pole?
Each picture should appear only once in every column, row and mini-grid. Don't guess! Use logic!