Legos are sprinkled across the carpet, a puzzle sits half-constructed on the table, and there is a jumble of dolls and toy trucks claiming space all over the sofa. Could this be your living room? For many parents who are in the throws of raising active, playful, and curious children, this is a common scene. But how to clean it all up, and fast? Molly Robinson, a Utah mother of four children ranging in ages from 1 to 8 years, shares a fun tip that works for her, every time. She picks a “mystery item,” keeps it in mind, and then has her kids put away all of the toys that are scattered about without telling them which toy she has chosen. After everything is cleaned and in its proper place, the child who happens to have picked up the mystery toy and put it in the correct spot wins a …