Print a circle page. Put the page on a metal cookie sheet.
You will need the Expo Whiteboard Magnets in two colors.
The magnets are available at some Sam's Club locations or on ebay.
To play each child is assigned a color of magnet. Players take turns putting one magnet
on the page. The object of the activity is for each player to try to get four of their magnets in a row. The first one to do that is the winner.
Printable Circle Magnet Page
If you can't locate magnet try these stackable discs.