Days of winter weather can make kids stir-crazy. When cabin fever strikes, clear some floor space and roll out an indoor hopscotch mat. This ancient British game was used for military training exercises at the time of the Roman Empire; kids eventually became its most passionate devotees, because it's just plain fun.
Source: Martha Stewart Kids, 2001
Cut primed canvas to 10 feet long and 45 inches wide; place it primed side down.
For squares: Center a 12-inch-square card-stock template 12 inches from bottom of mat; trace with a pencil. Position template 1 inch above first square; trace again. Continue, drawing board as shown.
Tape around inside of squares with masking tape, aligning with marks. Outline the entire board with tape, 1 inch out from squares. Paint the lines with acrylic paint. Paint numbers. Let dry; remove tape. To keep canvas from slipping on bare floors, lay carpet pad beneath it.