On your mark, get set, goo! Kids will like making this shape-shifting slime (it transforms from a solid to a liquid right in your hand) nearly as much as using it in place of a baton for a relay race.
Prizes for each member of the winning team can be a box of cornstarch, some food coloring and a recipe card for slime.
There's no neat way to play with slime. Kids should wear old clothes or smocks—the food coloring can stain. The slime hardens to a powdery substance if it sits more than half an hour. To clean the lawn, we drenched it with a hose, and the hard slime dissolved into the ground, leaving the grass unscathed. (Just to be safe, test beforehand whatever surface you will be using for ease of cleanup.)
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Bucket brigade—team members pass the slime from hand to hand to fill their bowl—the game inevitably starts with passing and progresses to hurling.
Prepare the slime by mixing one part water (tinted with a few drops of food coloring) to four parts cornstarch. If you dare, invite the guests to help you make it. Begin by rolling the ingredients around in a bucket; you'll find it easier than stirring the stuff. The slime is ready when it looks like a liquid but has a thick, smooth consistency that changes to ooze when touched. You might have to mix it with your hands for a minute before it's just right (you'll have plenty of volunteers for that assignment) or add a little water if it's too dry. It's best to try out a small batch before the party so you can see how it works and estimate how much you'll need. Pour the slime into a cauldron (a bucket or bowl) for each team. You'll need two additional empty bowls for each team, as well.
Definitely an outside game or one for foolhardy parents without wall-to-wall carpeting. Put the cauldron of slime for each team at one end of a yard and the empty bowl for each team at the other. We found 20 feet to be a nice run; the point isn't the distance but hanging on to the slime.
The kids form a line behind their team's cauldron of slime. On "Go!" one player after another (in relay style) runs with a sloppy handful of slime to fill the empty bowl. The first team to fill its cauldron wins.