Throughout the 1,500-square-foot indoor playground of Inflatable Insanity, kids surmount air-filled fortresses, only to slide down their slopes or jump on their bouncy interiors. Children under 39 inches retreat to the Tot Lot, and supervisory adults receive free admission to keep an eye on their tykes and make sure they share with their imaginary friends. Party rooms hold groups of up to 20, and hosts can parse out party favors such as self-stuffed teddy bears for an extra fee.