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Directions
Find a starting point for the children to stand.  Items can either be scattered or in a straight line.  Give each child 2-3 rings to toss. 

Toss around anything - find something that matches the party theme:  Stuffed or plastic dinosaurs (dinosaur theme), Small toy trucks, Beanie Babies, Lego towers
You could even use small wrapped or unwrapped prizes (box of crayons, small Lego kit, candy or treats)