Parents everywhere know the quiet pain induced by watching your child tear open the wrapping paper on a new gift, toss the actual game aside, and play with the box instead. A kid’s imagination need not be confined to existing rules or points system; they’ll make those up themselves, thanks very much. Swedish developer Toca Boca realized this truism and applied it to their eponymous brand of kids apps for smartphones. Instead of games with discrete goals and challenges, they developed interactive objects or bite-sized play environments, intuitive to pick up and play with as one would a physical toy.…